Square footage formula
For a rectangle or square, multiply the length in feet by the width in feet: square feet = length × width.
Multiple rooms
If several spaces have the same dimensions, use the quantity field. For rooms with different dimensions, calculate each separately and add the results.
Useful conversions
| From | To | Conversion |
|---|---|---|
| Square feet | Square yards | Divide by 9 |
| Square feet | Square meters | Multiply by 0.092903 |
Irregular spaces
Split an irregular room into rectangles, calculate each rectangle, then add the areas. This is often more reliable than estimating the full outline at once.
Worked example
A 15 × 12 foot room has an area of 180 square feet. That is 20 square yards or approximately 16.72 square meters.
Practical tips and limitations
- Measure with the same unit and convert inches to decimal feet before multiplying.
- Calculate differently shaped sections separately, then add them.
- This tool models rectangles and does not subtract columns, cabinets, or openings automatically.
Frequently asked questions
How do I calculate square feet?
Multiply length in feet by width in feet. For multiple identical areas, multiply that result by the quantity.
How many square feet are in a square yard?
One square yard contains 9 square feet.