Tables showing the SI equivalents of metric units and some older units commonly used, such as Square Feet (ft²), Square Yards (yd²), Acre, Square Miles (mi²), Scare Millimetre (mm²), Square Centimetre (cm²), Square Decimetre (dm²), Square Metre (m²), Are (a), Hectare (ha) and Square Kilometre (km²).
Units of Area Table
| Unit | SI equivalent | Inverse |
|---|---|---|
| 1 ft2 | equals 6.452 x 10 -4 m 2 | 1 m2 = 1550 in2 |
| 1 ft2 | equals 9.290 x 10-2 m2 | 1 m2 = 10.76 ft2 |
| 1 yd2 | equals 0.8361 m2 | 1 m2 = 1.196 yd2 |
| 1 acre | equals 4047 m2 | 1 m2 = 2.471 x 10-4 acre |
| 1 ha (hectare) | equals 104 m2 | 1 m2 = 10-4 ha |
| 1 mi2 | equals 2.590 x 106m2 | 1 m2 = 3.861 x 10-7 mi2 |
The Royal Society (1975) Quantities, Units and Symbols, London, The Royal Society
Area Table
| Unit | SI symbol | Conversion |
|---|---|---|
| square kilometre | km² | 1 km² = 100 ha |
| hectare | ha | 1 ha = 100 a |
| are | a | 1 a = 100 m² |
| square metre | m² | 1 m² = 100 dm² |
| square decimetre | dm² | 1 dm² = 100 cm² |
| square centimetre | cm² | 1 cm² = 100 mm² |
| square millimetre | mm² |