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Area converter
Surface area, from square millimetres to square miles. 10 units, converted from one table of exact factors.
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1 square foot in every other area unit
Computed by the same engine that runs the converter above, so these can never drift apart from it.
| From | Equals | Unit |
|---|---|---|
| 1 square foot | 0.09290304 | square meter (m²) |
| 1 square foot | 9.2903040 × 10^-8 | square kilometer (km²) |
| 1 square foot | 929.0304 | square centimeter (cm²) |
| 1 square foot | 92,903.04 | square millimeter (mm²) |
| 1 square foot | 0.000009290304 | hectare (ha) |
| 1 square foot | 3.5870064 × 10^-8 | square mile (mi²) |
| 1 square foot | 0.11111111 | square yard (yd²) |
| 1 square foot | 144 | square inch (in²) |
| 1 square foot | 0.000022956841 | acre (ac) |
What each unit actually is
Most converters give you a number and stop. Where a figure is exact by definition we say so, and where it is an average or shifts with conditions we say that too — that is usually the thing you needed to know.
| Unit | Symbol | What it actually is |
|---|---|---|
| square meter | m² | The SI derived unit. |
| square kilometer | km² | Exact. |
| square centimeter | cm² | Exact. |
| square millimeter | mm² | Exact. |
| hectare | ha | 10,000 m². Exact. A square 100 m on each side. |
| square mile | mi² | Exact. |
| square yard | yd² | Exact. |
| square foot | ft² | Exact. |
| square inch | in² | Exact. |
| acre | ac | Exactly 4,840 square yards. Originally the area one man and one ox could plough in a day. |
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