Appliance Energy Cost Calculator
Converts watts and daily hours into kWh, then multiplies by your $/kWh rate for day, month, and year estimates.
Limitation: Educational estimate only.
How to Use the Appliance Energy Cost Calculator
Enter the fields below, then review kWh and cost outputs.
Choose currency for display.
Use running watts
Startup surges are brief. Prefer continuous or average running watts for cost estimates.
What This Calculator Estimates
Generic appliance worksheet using watts × hours × rate. Specialized pages preset common devices but share this engine.
Worked Examples
1 kW load, 4 hours
Inputs
Estimated cost
4 kWh/day × 0.14 = 0.56/day; × 30 = 16.80.
Always-on 60 W device
Inputs
Estimated cost
1.44 kWh/day × 0.14 ≈ 0.2016/day; × 30 ≈ 6.05.
Compare to your bill
If estimates diverge from billed kWh, check hours, duty cycle, and whether your rate is tiered or time-of-use.
Frequently Asked Questions
Still have questions about this calculation?
Try the CalculatorFormulas & Assumptions
Transparent arithmetic from user-entered inputs. No live utility tariffs are loaded.
Formula
Daily energy
kWh/day = (watts ÷ 1000) × hours/day
Daily cost
cost/day = kWh/day × rate ($/kWh)
Monthly and yearly cost
month = day × days/month; year = day × 365
Scientific Background
Follows the common DOE educational approach: (watts/1000)×hours×rate. Duty cycles and inverter loads may need average watts.
Sources & review
Appliance Energy Cost Calculator documents the references behind its formulas and assumptions. Always treat results as educational estimates, not personalized professional advice.
Last reviewed
July 22, 2026
Reference
energy.gov
https://www.energy.gov/energysaver/estimating-appliance-and-home-electronic-energy-useReference
eia.gov
https://www.eia.gov/energyexplained/units-and-calculators/energy-conversion-calculators.phpFree Calculator Hub methodology
Free Calculator Hub
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See our methodology and corrections policy.