How this calculator works
A square kilometre is one million square metres. The international acre is 4,046.8564224 square metres, so one square kilometre contains 1,000,000 / 4,046.8564224 = 247.105381467 acres. A hectare is 10,000 square metres, so one square kilometre is exactly 100 hectares.
Formula
acres = square kilometres x 247.105381467165. square kilometres = acres / 247.105381467165. hectares = square kilometres x 100. square miles = square kilometres / 2.589988110336.
Worked example
1 km2 = 247.105381467 acres = 100 ha = 0.386102158542 square miles. 1,000 acres = 4.0468564224 km2 = 404.68564224 ha.
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Frequently asked questions
How many acres are in a square kilometre?
About 247.105 acres. The exact value follows from the exact acre and square kilometre definitions, and it is not a round number because the units come from different measurement systems.
How many hectares are in a square kilometre?
Exactly 100. Both units are metric, and a hectare is defined as 10,000 square metres while a square kilometre is 1,000,000 square metres.
Is a square kilometre the same as a kilometre?
No. A kilometre measures length and a square kilometre measures area. A square kilometre is the area of a square one kilometre on each side.