Area Converter
Convert any area unit to any other — square feet, square metres, square yards, acres and hectares, with exact constants.
Area units are the ones that trip people up — square feet, square metres, acres and hectares all measure the same thing in wildly different numbers. This converter moves between all five, exactly.
Pick the units, enter the value, and the conversion follows.
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 area value.
- Choose the unit it is in, and the unit to convert to.
- Read the converted area (and its square-metre value).
- Use the Copy results button to copy the answer.
Worked example
| Value | 100 ft² |
|---|---|
| To square metres | 100 × 0.09290304 = 9.2903 m² |
| 1 hectare to acres | 10,000 ÷ 4046.8564224 = 2.4711 acres |
| 1 acre to square feet | 4046.8564224 ÷ 0.09290304 = 43,560 ft² |
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 many square metres are in a square foot?
0.09290304 m² (exact). So 100 ft² is 9.2903 m². This converter uses the exact constant.
How many acres are in a hectare?
2.4711 acres (10,000 ÷ 4046.8564224). A hectare is 10,000 m²; an acre is 4,046.8564224 m².
How many square feet are in an acre?
43,560 ft². An acre is defined as 43,560 ft² — a rectangle of 66 ft × 660 ft (one chain by one furlong).
Which area unit should I use?
Square feet in the US, square metres in the UK, EU and Australia, acres or hectares for land. This converter moves between all five.
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.