What is the Square Footage Calculator?
The square footage calculator multiplies length by width to give the area of a room, floor or plot in square feet and square metres. Add a price per unit to estimate flooring or paint cost.
How to use the Square Footage tool
- Enter Length, Width and Unit.
- The result updates instantly as you type, or press Calculate.
- Use Try an example to see how it works, and Reset to start again.
Formula
Area = length × width. One square metre is 10.7639 square feet.
Worked example
With length 15, width 12, unit Feet, the area comes to 180 sq ft. Square meters: 16.72 m².
Frequently asked questions
How do I measure an irregular room?
Split it into rectangles, calculate each area and add them together.
Should I add extra for waste?
Yes. For flooring and tiles, add about 5 to 10% for cuts and waste.
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Checked by Calcovate · Formula tested against worked examples · Updated 7 Nov 2026 · How we check our calculators.