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Square Kilometer Converters

Convert square kilometers to and from square miles, hectares, acres, square meters, and other area units.

What this tool does

Convert square kilometers to and from square miles, hectares, acres, square meters, and other area units. Type an amount in square kilometers, choose the units, and the tool converts it to square miles. It offers 6 area units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Square kilometer, Square mile, Hectare, Acre (international), Square meter, Square foot. Starts as Square kilometer.
  • To: Choose one of the same 6 units as "From". Starts as Square mile.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. 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 kilometers to square miles:

  • 1 km² ≈ 0.386102 mi²
  • 5 km² ≈ 1.930511 mi²
  • 10 km² ≈ 3.861022 mi²
  • 50 km² ≈ 19.305108 mi²
  • 100 km² ≈ 38.610216 mi²

Multiply the number of square kilometers by about 0.386102 to get square miles. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

Sources: Square kilometer: exact by definition. Square mile: 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 miles are in one square kilometer?
A: One square kilometer is about 0.386102 square miles. Choose square kilometers as From and square miles as To to convert any value.
Q: How many hectares are in one square kilometer?
A: One square kilometer is 100 hectares. Choose square kilometers as From and hectares as To to convert any value.
Q: How many acres are in one square kilometer?
A: One square kilometer is about 247.105 acres. Choose square kilometers 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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