What this tool does
Convert square miles (mi²) to square kilometers (km²). Area unit conversion for land measurement. Type an amount in square miles, choose the units, and the tool converts it to square kilometers. It offers 4 area units and also shows the same amount in the others.
Inputs
- Value: A number.
- From: Choose one: Square mile, Square kilometer, Hectare, Acre (international). Starts as Square mile.
- To: Choose one of the same 4 units as "From". Starts as Square kilometer.
How to use
- Enter the amount you want to convert.
- Choose the unit to convert from and the unit to convert to.
- Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.
Worked examples
Conversions from square miles to square kilometers:
- 1 mi² ≈ 2.589988 km²
- 5 mi² ≈ 12.949941 km²
- 10 mi² ≈ 25.899881 km²
- 50 mi² ≈ 129.499406 km²
- 100 mi² ≈ 258.998811 km²
Multiply the number of square miles by about 2.589988 to get square kilometers. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.
Sources: Square mile: exact by definition. Square kilometer: exact by definition.
Limitations
- Converts units of area only. It does not work out an area from lengths or measure a plot.
- Square-unit conversions treat the area as a number: nothing about shape or location is considered.
FAQs
- Q: How many square kilometers are in one square mile?
- A: One square mile is about 2.58999 square kilometers. Choose square miles as From and square kilometers as To to convert any value.
- Q: How many acres are in one square mile?
- A: One square mile is 640 acres. Choose square miles as From and acres as To to convert any value.
- Q: Which acre does this use?
- A: The international acre, defined as 43,560 square international feet (4046.8564224 square meters). The US survey acre is larger by about four parts per million and is not offered here.
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