Pick a shape, enter the measurements in feet or inches, and get the area in square feet, square metres, square yards and acres — plus a material cost estimate for flooring, paint or turf projects.
For a rectangle or square, square feet is simply length × width, with both measurements in feet. A 12 × 12 ft room is 12 × 12 = 144 square feet. If you measured in inches, divide each side by 12 first — or just pick "Inches" in the calculator above.
| Size | Square feet | Square metres | Square yards |
|---|---|---|---|
| 8 × 10 ft | 80 sq ft | 7.4 sq m | 8.9 sq yd |
| 10 × 10 ft | 100 sq ft | 9.3 sq m | 11.1 sq yd |
| 10 × 12 ft | 120 sq ft | 11.1 sq m | 13.3 sq yd |
| 11 × 12 ft | 132 sq ft | 12.3 sq m | 14.7 sq yd |
| 12 × 12 ft | 144 sq ft | 13.4 sq m | 16.0 sq yd |
| 12 × 15 ft | 180 sq ft | 16.7 sq m | 20.0 sq yd |
| 12 × 20 ft | 240 sq ft | 22.3 sq m | 26.7 sq yd |
| 15 × 20 ft | 300 sq ft | 27.9 sq m | 33.3 sq yd |
| 20 × 20 ft | 400 sq ft | 37.2 sq m | 44.4 sq yd |
For land, the numbers get bigger: one acre is 43,560 square feet, so a half acre is 21,780 sq ft. See our guide to half an acre in square feet for the full picture.
12 × 12 = 144 square feet (13.4 sq m). That is a typical medium bedroom size in many homes.
Break it into rectangles (and triangles for angled corners), calculate each piece, and add the results. Sketching the room on paper first makes this much easier.
One acre = 43,560 square feet, about 4,047 square metres — roughly three-quarters of an American football field without the end zones.
Yes. Add 5-10% for straight plank or tile layouts and 10-15% for diagonal patterns, so cuts and mistakes do not leave you short.