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Area conversions square the linear factor, which is where most estimates go wrong. One meter is 3.28084 feet, but one square meter is 10.7639 square feet rather than 3.28. The same relationship gives 1 square kilometer = 0.386102 square miles, while 1 square inch = 6.4516 square centimeters is exact, because the inch itself is now defined exactly.
Land has its own units. An acre is 4,046.8564224 square meters, or 43,560 square feet, traceable to the strip a team of oxen could plough in a day - one furlong by one chain, 660 by 66 feet. A hectare is 10,000 square meters, or 2.47105 acres. Bigha is regional, ranging from about 1,600 to over 10,000 square meters depending on the state, so confirm the local definition before relying on it.
| m² | cm² | ft² | in² | yd² | ac | ha | km² | |
|---|---|---|---|---|---|---|---|---|
| 1 m² | 1 | 10000 | 10.76391 | 1550.0031 | 1.19599 | 0.000247 | 0.0001 | 1.0000e-06 |
| 1 cm² | 0.0001 | 1 | 0.001076 | 0.155 | 0.00012 | 2.4711e-08 | 1.0000e-08 | 1.0000e-10 |
| 1 ft² | 0.092903 | 929.0304 | 1 | 144 | 0.111111 | 2.2957e-05 | 9.2903e-06 | 9.2903e-08 |
| 1 in² | 0.000645 | 6.4516 | 0.006944 | 1 | 0.000772 | 1.5942e-07 | 6.4516e-08 | 6.4516e-10 |
| 1 yd² | 0.836127 | 8361.2736 | 9 | 1296 | 1 | 0.000207 | 8.3613e-05 | 8.3613e-07 |
| 1 ac | 4046.856422 | 4.0469e+07 | 43560 | 6.2726e+06 | 4840 | 1 | 0.404686 | 0.004047 |
| 1 ha | 10000 | 1.0000e+08 | 107639.104167 | 1.5500e+07 | 11959.900463 | 2.471054 | 1 | 0.01 |
| 1 km² | 1.0000e+06 | 1.0000e+10 | 1.0764e+07 | 1.5500e+09 | 1.1960e+06 | 247.105381 | 100 | 1 |
How many square feet are in a square meter? 10.7639. The figure comes from squaring 3.28084, the number of feet in a meter, which is why it is far larger than the linear factor and why estimates that use 3.28 are out by a factor of three.
How many square feet are in an acre? 43,560 by definition. An acre is also 4,046.8564224 square meters or 0.404686 hectares, and it is roughly the size of a football field without the end zones.
How many acres are in a hectare? 2.47105. A hectare is 10,000 square meters, a little under two and a half acres, and the inverse is 0.404686 hectares to the acre.
Why does bigha vary so much? Because it was never standardized. Bigha is a traditional land measure whose size was set locally, so it differs between states in India, Bangladesh and Nepal. Always confirm the local figure before converting.