322 Free Online Calculators
Browse all 322 published calculators for health, fitness, finance, education, and more. Accurate, fast, and mobile-friendly tools. Get instant, accurate results on any device.
Health & Fitness
BMI Calculator
Free BMI calculator to check your body mass index instantly. Get personalized health recommendations based on your height and weight. Accurate & easy to use.
BMI Calculator for Women
Calculate adult BMI from height and weight in metric or imperial units. See standard BMI categories with practical guidance for women, age, pregnancy, and muscle mass.
BMI Calculator for Men
Accurate BMI calculator specifically designed for men. Calculate your body mass index with male-specific interpretations and health recommendations.
Teen BMI Calculator
Free BMI calculator specifically designed for teenagers. Calculate body mass index with age-appropriate percentiles and get personalized health recommendations for teens.
Athlete Body Composition Calculator
Comprehensive body composition calculator specifically designed for athletes. Calculate BMI, muscle mass, optimal weight ranges, and get performance-oriented…
BMI Calculator for Muscular Men
Calculate standard BMI for a muscular or athletic build. Learn why BMI can overstate body fat and when waist or body-fat measurements add useful context.
BMR Calculator
Free BMR calculator to estimate your basal metabolic rate instantly. Get personalized calorie recommendations based on your age, gender, weight, and height using…
BMR Calculator for Women
Estimate women's BMR with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle. Compare resting calories with activity-adjusted daily needs.
BMR Calculator for Men
Estimate men's BMR with Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle. Compare resting calories with activity-adjusted daily needs.
Katch-McArdle Calculator
Calculate your BMR using the Katch-McArdle formula that considers body fat percentage. The most accurate method for athletes and those with known body composition.
Mifflin-St Jeor Calculator
Calculate your BMR using the Mifflin-St Jeor equation - the most accurate formula for basal metabolic rate. Get precise calorie estimates for weight management.
Harris-Benedict Calculator
Calculate your BMR using the original Harris-Benedict equation from 1919. Discover the historical formula that started metabolic rate calculations.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) with precision. Get personalized calorie recommendations for weight loss, gain, or maintenance based on your…
TDEE Calculator for Men
Calculate your Total Daily Energy Expenditure (TDEE) specifically for men. Get personalized calorie recommendations for weight loss, muscle gain, or maintenance based…
TDEE Calculator for Women
Estimate daily calories for women from BMR and activity level. Compare Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle and set a goal.
Daily Calorie Calculator
Calculate your daily calorie needs based on age, gender, activity level and weight goals. Get personalized nutrition recommendations and macro breakdowns.
Calorie Deficit Calculator
Free calorie deficit calculator to determine your daily calorie needs for weight loss. Get personalized recommendations based on your BMR, TDEE, and weight loss goals.…
Calorie Surplus Calculator
Free calorie surplus calculator to determine your daily calorie needs for healthy weight gain and muscle building. Get personalized bulking recommendations based on…
Weight Gain Calculator
Add a selected 0–500 kcal daily surplus to your current TDEE and view a clearly labeled static planning-rate equivalent for adults.
Macro Calculator
Calculate your optimal protein, carbs, and fat intake based on your goals. Free macronutrient calculator with personalized meal planning and recommendations.
Protein Calculator
Evidence-based protein calculator to determine your optimal daily protein intake. Personalized recommendations based on age, activity level, and health goals.
Body Fat Calculator
Free body fat calculator using Navy method and YMCA formula. Calculate your body fat percentage instantly with waist, neck, and hip measurements. Accurate & easy to use.
Navy Body Fat Calculator
Accurate Navy body fat calculator using the official US Navy formula. Calculate your body fat percentage with waist, neck, and hip measurements. Military-grade accuracy.
Cardiovascular Risk Calculator
Educational 10-year general CVD risk estimate using Framingham (D'Agostino 2008) coefficients from age, lipids, blood pressure, smoking, and diabetes.
One Rep Max Calculator
Estimate one-rep max from weight and reps using Epley or Brzycki formulas. Educational training math—not a form check or medical clearance.
Running Pace Calculator
Convert distance and finish time into pace per km and speed, plus optional Riegel projections to another race distance. Educational running math.
Waist-to-Hip Ratio Calculator
Calculate waist-to-hip ratio from same-unit measurements and compare it with clearly labeled sex-specific WHO population thresholds.
Lean Body Mass Calculator
Calculate lean body mass and fat mass from body weight and a measured body-fat percentage. Distinct from skeletal muscle mass estimates.
Ideal Weight Calculator
Calculate your ideal weight using multiple medical formulas. Get personalized recommendations based on height, gender, age, and body frame. Accurate & evidence-based.
Weight Loss Calculator
Free weight loss calculator with safe timeline planning. Calculate calories, target weight, and realistic timelines based on medical research. Healthy approach only.
Muscle Gain Calculator
Free muscle gain calculator to analyze your muscle-building potential using FFMI. Get personalized training and nutrition recommendations based on your genetic…
Muscle Mass Calculator
Calculate your muscle mass using proven medical formulas. Get personalized training and nutrition recommendations based on your muscle mass analysis. Accurate &…
Water Intake Calculator
Free water intake calculator to determine your optimal daily water consumption. Get personalized hydration recommendations based on your weight, activity, and climate.
Keto Macro Calculator
Calculate ketogenic diet macronutrients with medical safety warnings. Get personalized keto ratios with proper health supervision requirements.
Period Calculator
Project up to 12 future period start dates from the first day of your last period and your own average cycle length.
Sleep Calculator
Estimate sleep duration and 90-minute cycles from bedtime and wake time you enter. Compare to your own target hours. Educational only—not medical advice.
Meal Prep Calculator
Plan weekly meal-prep servings, calories, food cost, and batch count from numbers you enter. Educational only—not a diet prescription.
Yoga Calorie Burn Calculator
Estimate yoga session kilocalories from a MET value, duration, and body mass you enter. Educational only—not a fitness prescription.
Heart Rate Zone Calculator
Calculate personalized heart rate training zones using the scientifically-validated Karvonen method. Optimize your workouts with accurate HR zones for fat burn…
Exercise Calculator
Estimate gross exercise energy expenditure from MET value, duration, and body mass with metric or imperial inputs and transparent assumptions.
Activity Tracker
Total up to three weekly activities as minutes and MET-minutes using your entered frequency, duration, and sourced MET assumptions.
Training Load Calculator
Calculate a single session-load record from session RPE multiplied by duration. No injury-risk, fatigue, or readiness prediction.
Step Counter
Convert steps and your measured stride length to kilometers or miles. Add duration for pace; no guessed calorie estimate.
Strength Training Calculator
Estimate gross resistance-training energy expenditure from a sourced Compendium MET intensity, body mass, and session duration.
Exercise Progression Calculator
Project your own starting load, repetitions, increment interval, weekly frequency, and plan length into a transparent week-by-week schedule.
Workout Split Calculator
Create a transparent 2–6 day weekly muscle-group rotation from your chosen training frequency and first workout day.
Pregnancy Weight Calculator
View educational singleton pregnancy weight-gain reference ranges by pre-pregnancy BMI and gestational week using CDC/IOM guidance.
Ovulation Calculator
Estimate an ovulation date and fertile window from your last period and average cycle length using an explicit 14-day luteal-phase assumption.
Finance
Pay Stub Calculator
Estimate a pay-stub net amount from gross pay, user-entered federal and state rates, and stated FICA rates. Educational only.
Mortgage Calculator
Estimate a fixed-rate home mortgage payment with optional monthly property tax, insurance and HOA assumptions. Uses no live rates or lender offers.
VA Loan Calculator
Estimate a fixed-rate VA home-loan payment from entered price, down payment, funding-fee scenario, rate and term. Not a VA quote.
Loan Calculator
Estimate payments and total interest for a fixed-rate, fully amortizing loan using your own amount, rate and term. No live rates or approval estimates.
Home Equity Loan Calculator
Estimate home equity at an entered combined LTV and model a fixed-rate home equity loan payment without implying approval or eligibility.
Compound Interest Calculator
Calculate compound growth from principal, recurring contributions, timing, term, rate and compounding frequency using assumptions you enter.
Investment Calculator
Project investment growth, compare contributions with assumed gains, and optionally estimate inflation-adjusted value. No return is promised.
HELOC Calculator
Estimate HELOC interest-only draw payments and later repayment payments using an explicit constant-rate, fixed-draw scenario.
Freelancer Tax Calculator
Estimate self-employment tax and a separate user-entered income-tax scenario for freelance net profit. Educational only.
Sales Tax Calculator
Estimate sales tax, pre-tax price, and total from a rate you enter. Add tax to a net price or extract tax from an inclusive total—educational only.
Refinancing Calculator
Compare an existing fixed-rate loan with a proposed refinance using remaining balance, closing costs, payment difference and simple break-even.
Retirement Calculator
Project retirement savings from current balance, monthly contributions, years to retirement, and an assumed return. Optional inflation-adjusted view. Educational only.
Credit Score Simulator
Explore a clearly illustrative score-change worksheet using utilization, payment history and new-account assumptions. Not a FICO or bureau score.
Roth IRA Contribution Calculator
Estimate the 2026 Roth IRA contribution ceiling from filing status, MAGI, age, and taxable compensation using IRS phase-out ranges. Educational only.
Student Loan Repayment Calculator
Estimate fixed-rate student loan payments, total interest and payoff time with an optional recurring extra payment.
Dividend Reinvestment Calculator
Model dividend reinvestment with a constant share price, constant yield, payout frequency and reinvestment percentage. Taxes and fees excluded.
Amortization Schedule Calculator
Generate a payment-by-payment principal, interest and remaining-balance schedule for a fixed-rate loan, including a cent-adjusted final payment.
Annuity Payout Calculator
Estimate a fixed payout from present value, term, rate and frequency. Compare ordinary and annuity-due timing; this is not an insurance quote.
Debt Snowball Calculator
Order debts by balance and simulate monthly minimums plus a fixed extra budget, with payoff order, interest and schedule.
SIP Calculator
Project a systematic investment plan from monthly contributions, years and a hypothetical annual return. No return is promised.
Crypto
Bitcoin Mining Calculator
Estimate daily mining profit from user-entered revenue, power draw, electricity rate, and pool fee. Educational only—no live hashrate or market APIs.
Crypto Staking Calculator
Project staking rewards from principal, APY, days, and compounds per year you enter. Educational only—not a protocol yield quote.
DeFi Yield Calculator
Compare simple vs daily-compound DeFi yield using principal, APY, and days you enter. Educational only—not a protocol quote.
ASIC Miner ROI Calculator
Estimate hardware payback days and horizon ROI from hardware cost and daily net profit you enter. Educational only.
Crypto Converter Calculator
Convert an amount with a rate and fee percent you enter. Educational only—no live FX or exchange APIs.
NFT Valuation Calculator
Blend floor price, comps average, and trait premium with weights you enter. Educational only—not a marketplace appraisal.
Ethereum Gas Fee Estimator
Estimate ETH and USD gas cost from gas limit, gwei, and ETH/USD you enter. Educational only—no live gas oracle.
Crypto Tax Estimator
Estimate tax on max(0, proceeds − cost basis) × rate%. Educational only—not filing software or legal advice.
Wallet Profit Tracker
Compute profit/loss and percent from cost basis and current value you enter. Educational only—not a portfolio app.
Blockchain Transaction Fee Calculator
Estimate native and USD network fees from fee units, price per unit, and asset USD you enter. Educational only.
Impermanent Loss Calculator
Estimate classic two-asset impermanent loss from a relative price ratio you enter. Educational only—not a pool forecast.
Yield Farming Optimizer
Compare 2–3 simple APR farm scenarios over a shared principal and horizon. Educational only—not a protocol ranking.
Work & Payroll
Time Calculator
Add or subtract two durations in hours and minutes for educational time worksheets. Not a timesheet or payroll system.
Hours Calculator
Calculate worked hours from start and end clock times minus unpaid break minutes. Educational only—not an FLSA determination.
Paycheck Calculator
Estimate net pay from gross pay minus user-entered tax withholdings, benefits, and other deductions. Not tax advice.
Vacation Pay Calculator
Track vacation hours with opening balance, accruals, and usage. Educational balance worksheet—not legal entitlement advice.
Sick Leave Calculator
Track sick leave hours with opening balance, accruals, and usage. Educational balance worksheet—not legal entitlement advice.
Hourly Wage Calculator
Estimate gross pay from hourly rate, regular hours, and user-entered overtime hours and OT rate. Not an FLSA wage determination.
Freelance Rate Calculator
Estimate a billable hourly rate from target income, expenses, billable hours, and a buffer percent. Educational planning only.
Overtime Pay Calculator
Estimate total pay from regular and overtime hours using user-entered rates. Educational only—not an FLSA overtime determination.
Remote Work Tax Deduction Calculator
Sum home-office, internet, equipment, and other expenses with an optional cap. Educational only—not Form 2106 or tax advice.
Salary Negotiation Calculator
Compare current and offered annual salary to see absolute and percent increase. Educational negotiation planning only.
Bonus Tax Estimator
Estimate bonus withholding and net bonus using a user-entered supplemental withholding rate. Not tax advice.
Education
GPA Calculator
Calculate semester or cumulative GPA on 4.0, 4.3, 4.5, weighted 5.0, or percentage scales. Add course credits, letter grades, Honors, AP, or IB.
Grade Calculator
Comprehensive grade calculator for current grades, GPA calculation, and grade predictions. Supports multiple grading systems including US, UK, and international scales.
Final Grade Calculator
Calculate the exact final exam score needed to reach a target course grade. See whether the goal is mathematically reachable from your current grade.
ECTS Calculator
Estimate ECTS credits from total learning workload and a selected hours-per-credit value. See the unrounded result and transparent rounding.
Credit Transfer Calculator
Estimate target-system credits from relative annual study loads and a planning eligibility percentage. Institutional evaluation is always required.
APA Reference Calculator (7th ed.)
Format APA references and in-text citations for books, journal articles, web pages, reports, videos, datasets, and more. Free, fast, and accurate APA 7th generator.
MLA Reference Calculator (9th ed.)
Create MLA 9 Works Cited entries for books, journal and newspaper articles, web pages, and videos with source-specific punctuation.
Study Abroad Cost Calculator
Build a study-abroad budget from tuition, housing, food, flights, insurance, and misc costs you enter, plus contingency. Educational only.
Scholarship Eligibility Calculator
See how many GPA, income, and credit criteria you meet against thresholds you enter. Educational only—not an official award decision.
Online Course ROI Calculator
Compare course price plus opportunity cost of time against an expected raise you enter. Educational only—not career or investment advice.
Quiz Average Calculator
Average quiz or test scores from a comma-separated list. Equal-weight mean for class gradebooks and study tracking.
Date & Time
Date Calculator
Add or subtract whole days, weeks, months or years from a date. Uses calendar-aware month-end and leap-year rules without DST drift.
Age Calculator
Calculate exact age on any date in years, months and days, plus total elapsed days. Handles leap years with clear calendar-based rules.
Working Days Calculator
Count Monday–Friday working days between dates, with inclusive or exclusive-end rules and an optional custom holiday list.
Time Zone Converter
Convert a local date and time between common IANA time zones with daylight-saving-aware browser internationalization data.
Holiday Planner Calculator
Estimate an inclusive-day holiday budget from start and end dates, a daily budget, and fixed trip costs you enter.
Days Between Dates Calculator
Count calendar days between two dates with explicit exclusive-end or inclusive semantics. Leap-year and DST-safe date-only calculation.
Real Estate
Mortgage with Government Support Calculator
Compare monthly payments with and without a user-entered assistance amount that reduces loan principal. Educational only.
Property Investment ROI Calculator
Estimate NOI, cash flow, cash-on-cash ROI, and cap rate from income, expenses, debt service, and value. Educational only.
Rental Yield Calculator
Estimate gross and net rental yield from property price, monthly rent, and annual operating expenses. Educational only.
Square Feet Calculator
Multiply length and width in feet to get area in square feet and square meters. Simple rectangular area worksheet.
Home Renovation Cost Calculator
Add kitchen, bath, flooring, electrical, plumbing, exterior, and other renovation costs, then apply a contingency percent.
Airbnb ROI Calculator
Estimate booked nights, revenue, NOI, and cash-on-cash ROI from ADR, occupancy, expenses, and cash invested. Not a forecast.
EV Charging Cost Calculator
Estimate monthly EV charging cost from miles and kWh rate, then compare with gasoline cost using MPG assumptions.
Home Solar Savings Calculator
Estimate net system cost, annual bill savings, simple payback, and multi-year net savings from production and rates.
Energy Efficiency Savings Calculator
Compare current and improved annual energy costs against upgrade cost for annual savings, payback, and five-year net.
Closing Cost Estimator
Add lender fees, title, prepaid taxes, transfer taxes, and other closing costs to estimate cash needed at closing. Educational only.
House Flip Profit Calculator
Estimate flip profit, ROI, and margin from purchase, renovation, holding, selling costs, and sale price. Educational only.
Math & Science
Percentage Calculator
Find what X% of Y is, what percent one number is of another, or reverse a percentage to recover the whole. Three classroom-ready modes with clear formulas.
Percentage Change Calculator
Apply a percent increase or decrease to a value, or reverse the change to recover the original. Distinct from measuring percent change between two known values.
Percent Error Calculator
Compute percent error and signed relative error from an experimental measurement and a nonzero theoretical value. Lab-ready absolute and relative views.
Ratio Calculator
Simplify a two-part ratio to lowest terms or split a total amount into shares that match the ratio. Integer GCD simplification with decimal fallback.
Proportion Calculator
Solve a/b = c/d for any missing term with cross-multiplication. Enter three known values and choose which letter to solve for.
Fraction Calculator
Add, subtract, multiply, or divide two fractions and simplify to lowest terms. See improper, mixed, and decimal forms with clear arithmetic steps.
Quadratic Equation Solver
Solve ax² + bx + c = 0 with the discriminant. See two real roots, a repeated real root, or clearly labeled complex conjugates—plus the parabola vertex.
Random Number Generator
Generate inclusive random integers or decimals in a range. Optional seed for reproducible class demos. Educational PRNG—not cryptographic security.
LCM & GCD Calculator
Find the GCD and LCM of two or more integers. Uses Euclidean GCD and pairwise LCM with clear running steps—ideal for fractions and scheduling problems.
Mean Median Mode Calculator
Calculate mean, median, mode, range, min, and max from a list of numbers. Handles even-count medians and multimodal datasets clearly.
Systems of Equations Calculator
Solve two linear equations in two unknowns with Cramer’s rule. See determinant checks and step-by-step status for unique, none, or infinite solutions.
Chemical Equation Balancer
Balance chemical equations like H2 + O2 = H2O. Get positive integer coefficients that conserve atoms on both sides.
Physics Force Calculator
Solve Newton’s second law for force, mass, or acceleration, and the constant-speed relations for speed, distance, or time.
Area Calculator
Find area for rectangles, triangles, circles, trapezoids, parallelograms, and ellipses. Pick a shape, enter dimensions, and see the formula used.
Perimeter Calculator
Find perimeter or circumference for rectangles, squares, triangles, circles, and regular polygons.
Circle Calculator
Start from radius, diameter, circumference, or area and recover every other circle measure.
Triangle Calculator
Solve sides, angles, area, and perimeter from SSS, SAS, ASA, or right-triangle inputs.
Rectangle Calculator
Find area, perimeter, diagonal, or a missing dimension from length, width, area, or perimeter.
Volume Calculator
Compute volume for boxes, cubes, cylinders, spheres, cones, pyramids, and prisms.
Surface Area Calculator
Find total or lateral surface area for common 3D solids with optional open bases on cylinders and cones.
Pythagorean Theorem Calculator
Solve for the hypotenuse or either leg in a right triangle using a² + b² = c².
Distance Formula Calculator
Find the distance between (x₁,y₁) and (x₂,y₂) with Δx, Δy, and the formula shown.
Slope Calculator
Compute slope m = (y₂−y₁)/(x₂−x₁) with vertical-line interpretation when Δx = 0.
Midpoint Calculator
Find the midpoint M = ((x₁+x₂)/2, (y₁+y₂)/2) between two coordinate points.
Standard Deviation Calculator
Compute mean, variance, and standard deviation from a comma-separated list with sample (n−1) or population (n) mode.
Variance Calculator
Calculate variance and standard deviation from a numeric list with clear sample vs population choice.
Probability Calculator
Compute basic probabilities including complements, independent intersections/unions, and conditional P(A|B).
Z-Score Calculator
Standardize a value with z = (x − μ)/σ and see an approximate percentile under a normal curve.
Confidence Interval Calculator
Build a confidence interval for a mean using sample size, spread, and confidence level with z critical values.
Sample Size Calculator
Estimate required sample size from confidence level, margin of error, and proportion or population SD.
Margin of Error Calculator
Compute margin of error from confidence level, sample size, and proportion or standard deviation.
Percentile Calculator
Find a percentile value from a data list using linear interpolation or nearest-rank method.
Quartile Calculator
Compute quartiles and interquartile range from a data list with your chosen percentile method.
Correlation Calculator
Compute Pearson correlation and r² from paired X and Y lists of equal length.
Linear Regression Calculator
Fit y = mx + b to paired data with slope, intercept, r, and r².
Weighted Average Calculator
Compute a weighted average from matching value and weight lists.
Exponent Calculator
Compute base raised to an exponent with domain checks for negatives and zero.
Square Root Calculator
Compute square roots or nth roots of a value with even-root domain checks.
Prime Factorization Calculator
Factor integers ≥ 2 into prime powers with trial division.
Everyday
Auto Loan Calculator
Estimate a fixed-rate auto loan payment, amount financed after down payment and trade-in, total interest, and a full amortization schedule. Educational only.
Car Payment Calculator
Estimate a car payment after trade-in, sales tax, fees, and down payment. Shows amount financed, tax, and interest totals for a fixed-rate scenario.
Percentage Increase Calculator
Calculate percentage increase or decrease from an original value to a new value. Shows signed numeric change and uses the original magnitude as the base.
Tip Calculator
Calculate a tip, total bill, and per-person share in any currency. Uses transparent cent rounding and supports groups from 1 to 1,000 people.
Discount Calculator
Calculate the final sale price and amount saved from a percentage discount. Currency-neutral results use transparent two-decimal rounding.
Dropshipping Profit Calculator
Calculate dropshipping profit after product, shipping, platform, payment, advertising, refund, and chargeback costs.
Currency Converter Worksheet
Convert an amount using an exchange rate and percentage fee you enter. This educational calculator does not provide live currency rates.
Inventory Turnover Calculator
Calculate inventory turnover and days inventory from cost of goods sold and average beginning and ending inventory.
Shipping Cost Calculator
Add freight, packaging, handling, insurance, and surcharges to calculate total shipping cost and cost per unit.
Unit Converter
Convert length, mass, temperature, and explicitly labeled US liquid volume units using documented exact factors and absolute-zero validation.
Specialized & Niche
Money Transfer Cost Calculator
Estimate remittance fees from a percent fee plus fixed fee on a user-entered amount. Educational only—not live FX.
SEO Cost Calculator
Estimate a monthly SEO budget from retainer, tools, and content hours × rate. Educational planning—not ranking guarantees.
Solar Panel ROI Calculator
Estimate simple solar payback and annual ROI from system cost, annual savings, and incentives you enter. Educational only.
Carbon Credit Investment Calculator
Estimate net carbon-credit value as credits × price minus fees. Educational only—not investment, tax, or market advice.
Podcast ROI Calculator
Compare podcast production cost to sponsorship and other revenue you enter. Educational ROI—not earnings advice.
YouTube Earnings Estimator
Estimate YouTube earnings from views and RPM you enter. Educational only—not a Google AdSense payout promise.
Psychology & Personal Development
Stress Level Calculator
Rate work, relationships, finances, health, and sleep disruption from 0–10 to build an educational stress index. Not a clinical screening tool.
Productivity Score Calculator
Combine focus vs planned hours, task completion, and energy into an educational productivity score. Not a performance review.
Happiness Index Calculator
Rate life satisfaction, social connection, purpose, physical wellbeing, and financial security from 0–10 for an educational happiness index.
Burnout Risk Assessor
Rate exhaustion, cynicism, reduced efficacy, workload pressure, and recovery deficit from 0–10. Educational only—not a clinical burnout diagnosis.
Business & Marketing
CPC ROI Calculator
Estimate paid campaign ROI, profit, ROAS, ad spend, and conversions from clicks, average CPC, conversion rate, revenue, and variable costs.
Affiliate Commission Calculator
Calculate affiliate commission from eligible sales, reversals, a percentage rate, and a fixed bonus. See net sales and effective payout rate.
AdSense Revenue Estimator
Estimate display-ad earnings from pageviews and an RPM you enter. This educational worksheet is not a Google AdSense payout forecast.
CPM Calculator
Calculate CPM and cost per impression from campaign cost and delivered impressions. Supports common currencies and zero-cost earned inventory.
PPC Budget Planner
Estimate a PPC campaign budget from target clicks, average CPC, percentage management fees, and fixed campaign costs.
Content Marketing ROI Calculator
Calculate content marketing ROI from production and distribution costs plus attributed and other revenue you enter for one planning period.
Influencer Collaboration Cost Calculator
Estimate an influencer collaboration's total cost and CPM from creator, product, rights, management, and impression assumptions you enter.
Ecology & ESG
Water Usage Footprint Calculator
Total indoor, outdoor, and other daily gallons over a period, per person, and versus an optional target. Educational water planning only.
Plastic Waste Reduction Calculator
Estimate baseline plastic pounds from weekly items, then apply a reduction percent to see avoided waste. Educational planning only.
Biodiversity Impact Assessor
Educational score from land acres, native/protected share, and annual disturbed vs restored acres. Not a species or regulatory assessment.
Recycling Impact Calculator
Total recycled pounds by material and apply a diversion percent to estimate pounds kept out of disposal. Educational only.
AI & Digital
Token Cost Calculator
Calculate the cost of one AI token workload from your input and output token counts and your own per-million-token rates.
AI Prompt ROI Calculator
Estimate prompt-optimization ROI from labor hours saved, hourly cost, and weekly AI API and tool spending over a chosen period.
Data Privacy Compliance Cost Calculator
Estimate a privacy-program budget from staff time, software, consulting, and audit costs you enter; it does not assess legal compliance.
VR/AR Development Cost Calculator
Estimate a VR or AR project budget from design and engineering hours, labor rates, assets, platform fees, and other costs you enter.
AI Model Training Cost Calculator
Estimate an AI training run from accelerator count, hours, your hourly rate, storage, and other explicit project costs.
LLM API Cost Calculator
Project a monthly LLM API budget from request volume, average input and output tokens, your rates, and fixed platform costs.
Website AI Chatbot ROI Calculator
Estimate website chatbot ROI from support tickets deflected, cost per ticket, and monthly API and platform costs over a chosen period.
AI Video Generation Cost Calculator
Plan AI video costs from clips, unit or credit pricing, duration, expected retries, upscaling, and post-production costs.
Auto & Transport
Fuel Efficiency Calculator
Calculate miles per gallon, liters per 100 km, and fuel cost per mile from distance, fuel used, and price.
EV Range Estimator
Estimate electric-vehicle range from usable battery kWh, miles per kWh, and an optional reserve percentage.
Car Insurance Cost Calculator
Total liability, collision, comprehensive, and other car insurance premiums, subtract discounts, and optionally compute cost per mile.
Small Business & SaaS
SaaS Pricing Calculator
Estimate a monthly SaaS price floor that satisfies entered gross-margin and simple CAC-payback targets.
Profit Margin Calculator
Calculate gross profit, gross margin percentage, and markup from revenue and cost of goods sold without confusing margin with markup.
Break-Even Point Calculator
Calculate break-even sales units and revenue from fixed costs, selling price, and variable cost per unit.
Customer Lifetime Value Calculator
Estimate contribution-margin customer lifetime value with constant retention and discount rates, then compare CLV with acquisition cost.
Employee Cost Calculator
Estimate annual, monthly, and hourly employer cost from salary plus user-entered payroll, benefits, and overhead assumptions.
Business Loan Eligibility Checklist Calculator
Compare your business years, revenue, DSCR, and credit score with thresholds you enter. Educational only; it is not a loan approval decision.
Life Events
Wedding Cost Calculator
Add venue, catering, photography, attire, and other wedding categories, then apply contingency and optional cost per guest.
Baby Cost Calculator
Combine nursery, gear, clothing, and monthly baby costs over a planning horizon to estimate total and average monthly spend.
Moving Cost Calculator
Add movers or truck, packing, travel, temporary housing, deposits, storage, and other move costs into one relocation total.
Gift Budget Planner
Plan gift spending from recipients and average gift amount, then compare wrapping, shipping, and total spend against a budget cap.
Legal & Insurance
Car Accident Settlement Calculator
Add economic losses, general damages, fault share, and prior payments to organize a settlement worksheet. Educational only—not a claim valuation.
Small Claims Court Calculator
Compare your claim to a jurisdiction limit and total filing, service, and other court costs. Educational only—not legal advice.
Life Insurance Needs Calculator
Estimate additional life coverage from income replacement, debts, education funds, and final expenses minus existing coverage and assets.
Seasonal & Trending
Tax Refund Estimator
Educational estimate of a tax refund or amount due from payments, tax before credits, and refundable vs nonrefundable credits.
Holiday Gift Calculator
Plan holiday gifts, travel, food, decorations, and charity against a seasonal budget cap—not a store price feed.
Back to School Budget Calculator
Total back-to-school supplies, clothing, fees, technology, and transport with contingency, then compare with a budget cap.
Construction & DIY
Concrete Calculator
Estimate slab concrete in cubic yards and how many bags you need from length, width, thickness, waste percent, and bag yield.
Paint Calculator
Estimate paint gallons from wall and ceiling area, openings, coats, and coverage per gallon. Plan DIY interior painting without overbuying.
Tile Calculator
Estimate how many tiles and boxes you need from room size, tile size, waste percent, and tiles per box.
Flooring Calculator
Estimate flooring material square footage with a waste percent and optional boxes from carton coverage. Distinct from property square-feet converters.
Mulch & Soil Calculator
Convert bed length, width, and depth into cubic feet and cubic yards, with optional bag counts for mulch or soil.
Brick Wall Calculator
Estimate bricks for a single-wythe wall from wall size, brick face size, mortar joint, and waste percent.
Food, Cooking & Baking
Cups to Grams Calculator
Convert US cups to grams for common baking ingredients using King Arthur Baking cup weights. Pick an ingredient, enter cups, get grams and tablespoons.
Grams to Cups Calculator
Convert grams to US cups for common baking ingredients using King Arthur cup weights. Enter grams, pick an ingredient, get cups and tablespoons.
Tablespoons to Cups Calculator
Convert tablespoons to US cups using the standard 16 tablespoons per cup. Enter tbsp, get cups, millilitres, and the conversion factor.
Teaspoons to Tablespoons Calculator
Convert teaspoons to tablespoons using 3 teaspoons per tablespoon. Enter tsp, get tbsp, cups, and millilitres.
Milliliters to Cups Calculator
Convert millilitres to US cups (236.588 mL per cup). Also useful for fluid ounces via the same volume engine.
Recipe Scaling Calculator
Scale any ingredient amount when you change serving counts. Enter original servings, desired servings, and one ingredient quantity.
Baking Pan Conversion Calculator
Compare round, square, and rectangular pan areas to scale batter when changing pan size. Assumes similar fill depth.
Oven Temperature Converter
Convert oven temperatures between Fahrenheit and Celsius with approximate UK gas mark for common roasting and baking ranges.
Dough Hydration Calculator
Calculate bread dough hydration percent from flour and water weights. Hydration = water ÷ flour × 100.
Coffee to Water Ratio Calculator
Calculate pour-over and filter coffee doses using weight ratios (e.g., 1:16 coffee to water). Enter coffee, water, or both to solve.
Cups to Grams Flour
Convert US cups of all-purpose flour to grams using the King Arthur 120 g per cup reference for spooned, leveled cups.
Cups to Grams Sugar
Convert US cups of granulated sugar to grams using King Arthur 198 g per cup for loosely filled, leveled white sugar.
Cups to Grams Butter
Convert US cups of butter to grams using King Arthur 226 g per cup (two sticks). Shows tablespoons equivalent.
US Taxes
Federal Income Tax Calculator
Estimate U.S. federal ordinary income tax for Tax Year 2026 from taxable income and filing status using IRS Rev. Proc. 2025-32 brackets.
Tax Bracket Calculator
See which 2026 federal tax bracket your taxable income falls into, with marginal rate, effective rate, and per-bracket tax breakdown.
Tax Withholding Calculator
Estimate TY2026 federal income-tax withholding per paycheck by annualizing wages and brackets—distinct from gross-to-net paycheck math, with optional extra withholding.
Self-Employment Tax Calculator
Estimate Tax Year 2026 self-employment tax (Social Security and Medicare) on net profit using the 92.35% Schedule SE factor and the $184,500 Social Security wage base.
Quarterly Estimated Tax Calculator
Estimate quarterly federal estimated tax payments from expected annual tax minus expected withholding, with optional prior-year safe-harbor floor.
FICA Tax Calculator
Estimate employee FICA for Tax Year 2026: 6.2% Social Security to the $184,500 wage base, 1.45% Medicare, and 0.9% Additional Medicare when applicable.
Standard Deduction Calculator
Look up the Tax Year 2026 federal standard deduction by filing status, including additional amounts for age 65+ and blindness from Rev. Proc. 2025-32.
Taxable Income Calculator
Estimate federal taxable income for Tax Year 2026 from adjusted gross income minus the standard deduction or your itemized deduction amount.
Capital Gains Tax Calculator
Estimate Tax Year 2026 federal tax on long-term and short-term capital gains using Rev. Proc. 2025-32 preferential brackets stacked on ordinary taxable income.
Long-Term Capital Gains Tax Calculator
Estimate Tax Year 2026 federal tax on long-term capital gains using IRS 0%, 15%, and 20% preferential taxable-income ceilings from Rev. Proc. 2025-32.
Short-Term Capital Gains Tax Calculator
Estimate the Tax Year 2026 federal ordinary-income tax impact of short-term capital gains using Rev. Proc. 2025-32 brackets.
Child Tax Credit Calculator
Estimate TY2026 Child Tax Credit and ACTC using the $2,200 maximum, $1,700 refundable ceiling, and MAGI phaseouts from Rev. Proc. 2025-32.
Earned Income Tax Credit Calculator
Estimate the Tax Year 2026 Earned Income Tax Credit using Rev. Proc. 2025-32 earned-income amounts, maximum credits, and phaseout thresholds.
Itemized Deduction Calculator
Estimate TY2026 itemized deductions with the OBBBA SALT cap, medical AGI floor, mortgage interest, charity, and a standard-deduction comparison.
1099 Tax Calculator
Estimate combined Tax Year 2026 federal tax on 1099/NEC net profit: self-employment tax plus ordinary income tax after the deductible half of SE tax.
Federal Tax Refund Calculator
Estimate a Tax Year 2026 federal refund or amount due from taxable income, ordinary tax, credits, and payments—distinct from the seasonal generic refund worksheet.
Personal Budgeting
Monthly Budget Calculator
Enter monthly income plus needs, wants, and savings to see remaining cash, category percents, and surplus or deficit—educational budgeting arithmetic only.
50/30/20 Budget Calculator
Split after-tax monthly income into 50% needs, 30% wants, and 20% savings. Optional actuals show variance against the educational rule of thumb.
Savings Goal Calculator
Estimate months to reach a savings goal or the monthly deposit required, with optional monthly compounding from an annual rate you enter.
Emergency Fund Calculator
Multiply essential monthly expenses by a target number of months to size an emergency fund, then compare to current savings for gap and coverage.
Net Worth Calculator
Estimate net worth as total assets minus total liabilities, with optional leverage as liabilities ÷ assets. Educational snapshot—not a wealth-management plan.
Rent Affordability Calculator
Estimate a rent ceiling from monthly income and a rent-to-income guideline (often ~30%). Compare a proposed rent and headroom—educational only, not a landlord screen.
Car Affordability Calculator
Estimate car payment and ownership-cost ceilings from income using educational guidelines (~10% payment / ~20% total). Compare a proposed payment—not a lender quote.
House Affordability Calculator
Estimate housing payment and rough purchase-price ceilings from income using educational front-end/back-end DTI guidelines and an income multiple—not underwriting.
Debt-to-Income Ratio Calculator
Calculate educational front-end and back-end DTI from gross monthly income, housing, and other debts—with optional 28/36 guideline comparison.
Home Utilities
Electricity Cost Calculator
Estimate monthly and yearly electricity cost from kWh usage, $/kWh rate, and an optional fixed fee—educational bill math, not your utility invoice.
Kilowatt-Hour Cost Calculator
Convert any kilowatt-hour amount into cost at your $/kWh rate—simple energy arithmetic for bills, appliances, or what-if scenarios.
Appliance Energy Cost Calculator
Estimate daily, monthly, and yearly running cost for any appliance from watts, hours per day, and your electricity rate.
Home Energy Usage Calculator
Estimate household electricity use and cost from a monthly kWh total or up to three appliance loads sharing one rate.
Air Conditioner Cost Calculator
Estimate window or central AC running cost from cooling watts, daily hours, and your electricity rate.
Heater Running Cost Calculator
Estimate electric whole-room or baseboard heater cost from watts, hours per day, and your rate.
Space Heater Cost Calculator
Estimate portable electric space heater cost using typical 1500 W draw, daily hours, and your electricity rate.
Refrigerator Energy Cost Calculator
Estimate refrigerator electricity cost using average running watts and hours per day (often near 24 with duty cycle).
Washing Machine Cost Calculator
Estimate washing machine electricity cost from motor/heater watts and average hours of use per day.
Dryer Electricity Cost Calculator
Estimate electric clothes dryer cost from heating-element watts, daily hours, and your electricity rate.
Electrical DIY
Ohm's Law Calculator
Solve Ohm’s law for voltage, current, resistance, or power from any valid pair of known values—clear DC/resistive relationships for DIY electronics.
Watts to Amps Calculator
Convert watts to amps for DC or single-phase AC, with optional power factor and three-phase mode—educational load estimates.
Amps to Watts Calculator
Convert amps to watts for DC or single-phase AC, with optional power factor and three-phase mode—mirror of the watts-to-amps worksheet.
Voltage Drop Calculator
Estimate one-way run voltage drop from amps, length, AWG, and copper/aluminum resistance tables—educational planning aid.
Wire Size Calculator
Estimate a minimum AWG from load amps, length, voltage, and a max drop % using simplified ampacity and resistance tables—with strong educational caveats.
Breaker Size Calculator
Estimate a standard breaker amp rating from load amps using a continuous-load ×1.25 rule of thumb—educational only, not code approval.
Electrical Load Calculator
Add up to four watt loads, convert to amps at your voltage, and apply an optional continuous factor for educational circuit planning.
Battery Runtime Calculator
Estimate how long a battery can run a watt load from amp-hours, voltage, depth of discharge, and efficiency—simple DC energy math.
Battery Capacity Calculator
Estimate the amp-hours you need for a watt load and target runtime, including depth of discharge and efficiency factors.
LED Resistor Calculator
Size a series resistor for one or more LEDs from supply voltage, forward voltage, and forward current—plus a preferred E24 value and power estimate.
Pets
Dog Age Calculator
Convert your dog’s age into a size-based human-year equivalent using common educational aging charts—not a veterinary geriatric diagnosis.
Cat Age Calculator
Estimate a cat’s human-year equivalent with the common 15 / 9 / +4 educational chart—clear assumptions, not veterinary advice.
Dog Food Portion Calculator
Estimate daily dog food portions from weight, life-stage MER factor, and your food’s kcal per cup or can—educational RER/MER math, not a prescription diet.
Cat Food Portion Calculator
Estimate daily cat food portions from weight, life-stage factor, and label kcal density using educational RER/MER worksheets.
Puppy Growth Calculator
Project adult weight from current puppy weight and age using size-class growth-curve percentages—or reverse the curve for an expected weight at age.
Pet Cost Calculator
Add adoption/setup one-time costs to monthly pet expenses to estimate first-year total, annual recurring spend, and a multi-year planning horizon.
Dog Calorie Calculator
Estimate daily dog calorie needs with RER = 70×kg^0.75 and educational MER life-stage factors—planning math, not a medical diet order.
Cat Calorie Calculator
Estimate daily cat calorie needs with RER = 70×kg^0.75 and educational cat MER factors for neutered, intact, active, kitten, or weight-loss planning math.
Parenting & Childcare
Childcare Cost Calculator
Estimate annual and first-year childcare costs from a day, week, or month rate plus registration, materials, and other fees you enter.
Daycare Cost Calculator
Turn a daily daycare rate, days per week, and weeks per year into annual tuition plus registration, supplies, and late-pickup averages.
Babysitting Rate Calculator
Calculate a babysitting session total from hourly rate, hours, extra kids, and tip—plus an optional weekly or annual planning estimate.
Nanny Cost Calculator
Estimate total employer cost for a nanny from hourly wage, hours, weeks, a user-entered employer tax percent, benefits, and agency fees.
College Savings Calculator
Project a college or 529-style savings balance from starting balance, monthly deposits, and an assumed return—educational math, not tax or investment advice.
Baby Formula Cost Calculator
Estimate baby formula spending from price per can and cans per week, with optional extras and a custom week horizon.
Diaper Cost Calculator
Estimate diaper spending from diapers per day and pack pricing, with optional wipes and other monthly extras over a multi-month horizon.
Parental Leave Calculator
Estimate income during parental leave from your salary, employer-paid percent, and any weekly state or other benefits you enter—not eligibility or legal advice.
Travel Costs
Gas Cost Calculator
Estimate total gasoline cost for a trip from distance, miles per gallon, and the fuel price you enter—plus gallons needed and cost per mile.
Road Trip Cost Calculator
Build a road-trip total from fuel (miles, MPG, price), lodging nights, daily food, tolls, and miscellaneous expenses you enter.
Mileage Calculator
Estimate driving cost from distance using either a cost-per-mile rate or fuel math (MPG and price), with an optional round-trip multiplier.
Commute Cost Calculator
Estimate round-trip commute fuel cost from one-way miles, MPG, and fuel price, plus optional parking and other daily costs—annualized by workdays.
Mileage Reimbursement Calculator
Multiply business or personal miles by the reimbursement rate you enter. IRS standard mileage rates change; this tool never hardcodes a live IRS figure.
Travel Budget Calculator
Add transport, lodging, food, activities, insurance, and misc, then optionally apply a contingency percent for a complete travel budget total.
Vacation Cost Calculator
Estimate a vacation total from travelers, lodging nights, food per person per day, and user-entered flights, activities, local transport, and misc.
Travel Time Calculator
Estimate driving time from distance and average speed, with optional fixed breaks and recurring rest stops every N hours.
Rental Car Cost Calculator
Estimate rental car spend from daily rate and days, plus optional insurance, one-way fees, mileage overage, other fees, and tax percent.
Hotel Cost Calculator
Estimate lodging totals from nightly rate, nights, and rooms, plus tax percent, optional resort fees per night, and a cleaning fee.
Ecommerce Fees
Stripe Fee Calculator
Estimate Stripe-style card fees from a percent plus fixed fee, or gross up a charge so you keep a target net. Educational worksheet—enter your pricing-page rates.
PayPal Fee Calculator
Estimate PayPal-style payment fees from a percent plus fixed fee, or gross up a payment so you keep a target net. Enter rates from your PayPal fee schedule.
Etsy Fee Calculator
Estimate Etsy seller fees from transaction percent, listing fee, and payment processing percent plus fixed fee on a sale. Enter rates from Etsy’s fee schedule.
eBay Fee Calculator
Estimate eBay seller fees from final-value percent, optional insertion/fixed fee, and optional payment percent plus fixed fee. Enter rates from eBay’s selling fees page.
Amazon FBA Fee Calculator
Estimate Amazon FBA referral, fulfillment, and storage fees, then contribution after product cost. Enter Seller Central rates—not a live fee API.
Unit Converters
Kg to Lbs Calculator
Convert kilograms to pounds and pounds to kilograms using the exact international avoirdupois pound. Instant reverse mode.
Cm to Feet and Inches Calculator
Convert centimeters to feet and inches, or feet and inches back to centimeters, using the exact inch (2.54 cm).
Celsius to Fahrenheit Calculator
Convert Celsius to Fahrenheit and Fahrenheit to Celsius with absolute-zero validation. Bidirectional temperature points.
Liters to Gallons Calculator
Convert liters to US liquid gallons and back using the exact US gallon (3.785411784 L). Not UK imperial gallons.
Millimeters to Inches Calculator
Convert millimeters to inches and inches to millimeters with the exact inch (25.4 mm). Ideal for DIY and machining notes.
Square Meters to Square Feet Calculator
Convert square meters to square feet and back using the exact international foot (0.3048 m). For floor area planning.
Acres to Square Feet Calculator
Convert acres to square feet and square feet to acres using 1 acre = 43,560 ft². Common US land planning definition.
PSI to Bar Calculator
Convert pounds per square inch to bar and bar to psi using pascal-based exact factors. For tires, compressors, and specs.
Unit Converter
Convert length, mass, temperature, and explicitly labeled US liquid volume units using documented exact factors and absolute-zero validation.
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