Measure square footage for rooms, flooring, painting, and more. Supports rectangular, triangular, and circular shapes. Useful for estimating materials and project costs.
Square footage is the bedrock measurement of home improvement, real estate, and construction. It tells you how much flooring to buy, how much paint to mix, how much sod to order, what you're paying per square foot of a home, and a hundred other things. The calculation is straightforward for rectangles — length times width — but rooms, yards, and walls are rarely perfect rectangles, and getting the math right requires breaking irregular shapes into simpler ones.
This calculator computes square footage for rectangular areas, and lets you multiply by a quantity (for repeated rooms) and price per square foot for cost estimates. For irregular layouts — L-shaped rooms, rooms with bay windows, yards with corners cut out — measure each rectangular section separately, calculate the square footage of each, and add them together.
Always measure twice. A 6-inch error in either dimension on a 200 sq ft room throws off material orders by about 10 sq ft, which can leave a flooring or carpet job short.
Bedroom: 12 ft × 14 ft = 168 sq ft Most carpet is sold by the square yard: 168 / 9 = 18.67 sq yd Round up and add 10% for waste: 21 sq yd At $35/sq yd installed: $735 budget for the room.
Walls: two at 14 ft × 9 ft, two at 18 ft × 9 ft = (2 × 126) + (2 × 162) = 576 sq ft Subtract: 1 door (21 sq ft) + 3 windows (3 × 15 = 45 sq ft) = 66 sq ft Net wall area: 510 sq ft A gallon of paint covers about 350–400 sq ft, two coats. 510 sq ft × 2 coats = 1,020 sq ft of coverage. Need 3 gallons.
Use this any time you need to translate physical dimensions into a material order, a real estate listing, or a cost estimate. It's the right tool for floor plans, paint coverage, sod and lawn projects, room comparisons, and price-per-square-foot checks on home listings.
For very irregular shapes (circular features, sloped ceilings), use the dedicated geometry calculators on this site — circle, triangle, ellipse — to compute each section, then sum.
Real-estate listings in the U.S. typically use "gross living area" — finished interior space, excluding garages and unfinished basements. Be careful when comparing listings; "finished square footage" definitions vary by region and source.
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Total Square Footage
120 sq ft
Square Yards
13.3
| Unit | Value |
|---|---|
| Square Feet | 120 |
| Square Yards | 13.33 |
| Square Meters | 11.15 |
| Acres | 0.0028 |