Square Footage Calculator

Calculate area in sq ft, sq m, sq yd, acres for any shape — rectangle, circle, triangle, trapezoid, and more. Includes cost estimator and multi-room total.

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Square Footage Calculator

Select a shape, enter measurements, and optionally add waste factor and material cost.

Optional Settings
Multiply area by this number (e.g. 3 rooms)
Extra material % for cuts/waste (typically 5-15%)
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Multi-Room Calculator

Add multiple rooms or areas to calculate the total square footage for flooring, painting, or other whole-home projects.

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Price Per Square Foot

Calculate total cost from area + price, or find price per sq ft from total cost and area. Useful for real estate, flooring, and material planning.

Leave blank to calculate from total cost
Leave blank to calculate from price/sqft
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Area Unit Converter

Convert between square feet, square meters, square yards, square inches, acres, and hectares.

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Common Conversions & Formulas

Quick reference for area conversions and shape formulas.

Area Unit Conversions
1 sq ft = 144 sq in  |  1 sq ft = 0.0929 sq m
1 sq yd = 9 sq ft  |  1 acre = 43,560 sq ft
1 sq m = 10.764 sq ft  |  1 ha = 107,639 sq ft
1 sq mi = 27,878,400 sq ft  |  1 sq km = 10,763,910 sq ft
Shape Area Formulas
Rectangle: A = L × W
Square: A = S ²
Circle: A = π × r² (r = diameter/2)
Triangle (base × h): A = ½ × b × h
Triangle (3 sides): A = √(s(s-a)(s-b)(s-c)), s = (a+b+c)/2
Trapezoid: A = ½ × (a + b) × h
Ellipse: A = π × a × b
Sector: A = ½ × r² × θ (radians)
Room TypeTypical Size (sq ft)sq m
Small bedroom80 – 1207 – 11
Average bedroom120 – 20011 – 19
Master bedroom200 – 35019 – 33
Small living room150 – 25014 – 23
Average living room250 – 40023 – 37
Kitchen150 – 25014 – 23
Bathroom50 – 1005 – 9
1-car garage200 – 28019 – 26
2-car garage400 – 57637 – 54
Average US home2,000 – 2,500186 – 232
Waste Factor Guide
Flooring (straight lay): 5-10%
Flooring (diagonal/pattern): 10-15%
Tiles: 10-15%
Carpet: 5-10%
Paint: 0-5%
Wallpaper: 10-20%