Does this match MLS living area?

Not automatically. Listing standards may exclude or include spaces differently from a simple length × width product.

Why is sqft-calculator an alias?

Searchers use both “sq ft” and “square feet” for the same rectangular area calculation.

What if one dimension is zero?

Length and width must be greater than zero. A zero dimension is rejected as invalid.

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Square Feet and Square Meters Calculator

Convert a rectangular length and width in feet into area without guessing conversion factors.

Square-foot area

Square-meter conversion

Transparent NIST-based factor

Multiplies length and width in feet for rectangular area in square feet and converts the result to square meters.

Limitation: This calculator models a single rectangle.

Jump to calculator · Sources & review

Free Calculators HubSquare Feet Calculator

Length (feet)Width (feet)

How to Calculate Square Footage

Enter the length and width of one rectangular space in feet.

Measure or assume the length of the rectangle in feet.

Keep measurements consistent

Convert inches to decimal feet before entering values. Do not mix meters into the length or width fields.

What the Square Feet Result Means

The primary result is the product of length and width in square feet. Square meters use the fixed factor 0.09290304. The model assumes a perfect rectangle and does not infer ceilings, slopes, or usable living area definitions used by appraisers.

Square Footage Examples

Twenty by fifteen feet

Entered length and width

lengthFeet:20

widthFeet:15

Area in sq ft and sq m

300 sq ft; 27.87 sq m

20 × 15 = 300 square feet; 300 × 0.09290304 ≈ 27.87 square meters.

Twelve by ten feet

Entered length and width

lengthFeet:12

widthFeet:10

Area in sq ft and sq m

120 sq ft; 11.15 sq m

12 × 10 = 120 square feet; 120 × 0.09290304 ≈ 11.15 square meters.

Sum multiple rectangles

Break complex rooms into rectangles, calculate each area, then add the square-foot totals yourself.

Frequently Asked Questions

No. Enter feet only. The square-meter result is a conversion of the computed square footage.

Still have questions about this calculation?

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Area Formulas

Only user-entered length and width are used. No floor-plan database or living-area standard is applied.

Formula

lengthFeet × widthFeet

Square feet

lengthFeet × widthFeet

Square meters

areaSquareFeet × 0.09290304

Scientific Background

Assumptions: one rectangle, positive finite feet inputs, and the NIST SI length conversion factor. Limitations: irregular shapes, net vs gross floor area, and listing standards require additional measurement rules outside this calculator.

Sources & review

Square Feet 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
nist.gov
https://www.nist.gov/pml/owm/si-units-length
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