Square Metre Calculator
Calculate rectangular area in square metres and square feet, with an optional allowance for material ordering.
Set to 0 when you only need the measured area.
Enter your measurements and press Calculate area.
How to calculate square metres
For a rectangle, multiply the length in metres by the width in metres. For example, a 4m × 3m room has an area of 12m².
Why add a material allowance?
Flooring, tiles, decking and sheet materials often need extra for cutting and layout. The appropriate allowance depends on the product and pattern, so use the dedicated calculator where possible.
Frequently asked questions
How do I calculate an L-shaped room?
Split it into two rectangles, calculate each area and add the results.
How many square feet are in one square metre?
One square metre is approximately 10.764 square feet.