Square Meter Calculator
Work out an area in square metres — from length and width in metres, feet or inches — with square feet, yards and hectares alongside.
Square metres are the standard unit outside the US — and the one most suppliers quote in. This calculator is the metric twin of the square footage calculator.
Enter the sides in any unit; the answer comes back in square metres first.
Your results
Enter your measurements and press Calculate.
Quantities are rounded up to whole tiles, planks, boxes or bags, after the wastage allowance. Cost appears only when you enter a price.
Formula
All lengths are converted to a single unit before the calculation: 1 ft = 0.3048 m, 1 in = 25.4 mm, 1 ft² = 0.09290304 m², 1 yd² = 9 ft². Material quantities are rounded up — you cannot buy part of a tile, plank or bag.
How to use this calculator
- Enter the length and width (in metres, feet or inches).
- Read the area in square metres, feet, yards and hectares.
- Use the Copy results button to copy the answer.
Worked example
| Room | 3 m × 4 m |
|---|---|
| Square metres | 3 × 4 = 12 m² |
| Square feet | 12 × 10.7639104 = 129.17 ft² |
| Square yards | 12 ÷ 0.83612736 = 14.35 yd² |
| Hectares | 12 ÷ 10,000 = 0.0012 ha |
Check it by hand: every step above uses the formula in the box. If your numbers match the example inputs but the calculator gives a different answer, please report it via the contact page.
Frequently asked questions
How do I calculate square metres?
Multiply length by width in metres. A 3 m × 4 m room is 12 m². If your measurements are in feet or inches, enter them in those units — this calculator converts first.
How many square feet are in a square metre?
10.7639104 ft². So 12 m² is 129.17 ft². This calculator shows both, so you never have to remember the factor.
What is a hectare?
10,000 m² — about 2.47 acres. Hectares are used for land and large gardens; this calculator shows them for big areas.
Square metres or square feet — which should I use?
Use the unit your supplier uses: square metres in the UK, EU and Australia; square feet in the US. This calculator gives you both either way.
Related calculators
Estimates only. Results are for planning. Measure twice, confirm box coverage and tile sizes on the packaging you buy, and follow the manufacturer's instructions. See the disclaimer.