Area Converter
Convert between square metres, square feet, acres, hectares, square kilometres, and more.
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How to use this calculator
- 1
Enter your area value in the "From" field.
- 2
Select the unit you are converting from (e.g. square metres).
- 3
Select the unit you want the result in (e.g. square feet).
- 4
The converted value appears instantly.
Frequently asked questions
Which area units are included?
Square metres, square kilometres, square centimetres, square millimetres, hectares, acres, square feet, square inches, square yards and square miles. Square metres are the base, so each conversion goes through that unit.
How many square feet are in an acre?
Exactly 43,560 square feet, which the tool confirms. An acre equals 4,046.8564224 square metres when the international foot (0.3048 m) is used, which is the definition applied here. One acre is also 4,840 square yards, or 1/640 of a square mile.
What is a hectare?
A hectare is 10,000 m², the area of a 100 m by 100 m square. It is accepted for use with the SI and is standard for land area in most countries. One hectare is about 2.471 acres, and 100 hectares make one square kilometre.
Why is a square metre not 3.28 square feet?
Because 3.28084 is the length factor, and areas scale with its square. One metre is 3.28084 feet, but one square metre is 10.7639 square feet. The same applies to every area unit: squaring the linear factor gives the area factor.
Is the acre used here the US survey acre?
No. The converter uses the international acre, based on the foot of exactly 0.3048 m. The US survey acre, tied to the slightly longer survey foot, differs from it by a few parts per million, which matters only for large land surveys.
How big is a square mile in other units?
A square mile is 2,589,988.110336 m², about 2.589988 km², and exactly 640 acres. The tool uses that exact value, so 1 mi² shows as 2.58998811 km² rather than a rounded 2.59.
Can it work out the area of a room or plot from dimensions?
No. It converts an area you already know between units. To get an area, multiply length by width in the same unit first (or use a dedicated area calculator), then convert the result here.
Area unit conversion: square metres, acres, hectares and square feet
Square units are squared lengths
Every area unit comes from a length unit multiplied by itself, so its conversion factor is the square of the length factor. An international foot is 0.3048 m, which makes a square foot exactly 0.09290304 m², and an inch of 0.0254 m gives 6.4516 cm² per square inch. The converter keeps these relationships exact. Land units such as hectares and acres are defined on top of them.
Land area equivalents
The table expresses one acre and one hectare in other land and building units.
| Unit | Square metres | Hectares | Acres | Square feet |
|---|---|---|---|---|
| 1 acre | 4,046.856422 | 0.40468564 | 1 | 43,560 |
| 1 hectare | 10,000 | 1 | 2.471053815 | 107,639.104167 |
Worked examples: floors, plots and regions
A 100 m² apartment is 1,076.391042 ft², and a 50 m² studio is 538.1955208 ft². From the other side, a 2,000 ft² house has 185.80608 m² of floor, and 1,500 ft² is 139.35456 m². Real-estate listings can round differently, so compare the unrounded figures when it matters. A 5 acre plot covers 20,234.282112 m², roughly 2.02 hectares. A square mile holds 640 acres, equal to 2.58998811 km², and one square kilometre is 100 hectares or 0.38610216 square miles. Farm, forestry and planning documents mix these units freely. Convert them all to one unit before adding or comparing anything.
Avoiding common slips
Check whether a figure means square units or a length. A "20 foot by 20 foot room" is 400 ft², not 20. Do not carry a linear factor into an area without squaring it. Remember that this tool does not account for slope, and treats an acre as the international one.
Reading land and building areas
Property listings, farm records and planning documents rarely use the same unit. Convert each figure to square metres or hectares before comparing, then convert the final comparison into the unit your reader uses. Results appear to ten significant digits, which suggests a precision that survey data seldom has, so round sensibly. The tool also lists the figure in every supported unit at once, which is a quick way to see an acre alongside its square-foot and hectare equivalents.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →