CalcCoverageHow to calculate square footage
Square footage is length multiplied by width, with both measurements in feet. The only trick is the inches: convert them to a decimal foot first (inches ÷ 12), because 10 ft 6 in is 10.5 ft, not 10.6 ft.
Square feet = length (ft) × width (ft) · Square meters = square feet × 0.0929
Example: a room 12 ft 6 in long by 10 ft wide is 12.5 × 10 = 125 sq ft (11.6 sq m).
Measuring a whole floor
Break the space into rectangles — one per room, plus hallways — and add the rectangles together. L-shaped rooms are just two rectangles. This calculator's "add another room" button does the adding for you, and the per-room breakdown stays visible so you can check each one.
| Space | Typical size | Area |
|---|---|---|
| Small bedroom | 10 × 11 ft | 110 sq ft |
| Main bedroom | 12 × 14 ft | 168 sq ft |
| Living room | 14 × 18 ft | 252 sq ft |
| Single garage | 12 × 20 ft | 240 sq ft |
| Double garage | 20 × 20 ft | 400 sq ft |
Buying flooring, tile or paint off this number? Each of those materials has its own waste and coverage rules — use the dedicated calculators here so the buying quantities include the right allowances.