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Convert acre to square kilometer

Here you can quickly calculate how many square kilometer fit in one acre.
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- scroll: formula · table · questions -

  • 1 acre = 0.004047 km²
  • 1 km² = 247.105381 acre

Example: acre to square kilometer

  • 1 acre = 0.004047 square kilometer

Acre to square kilometer conversion table

acre square kilometer
1 0.004047
2 0.008094
5 0.020234
10 0.040469
20 0.080937
50 0.202343
100 0.404686

Acre to square kilometer formula

To convert acre to square kilometer, multiply by 0.004047.

1 acre = 0.004047 km²
Example: 1 acre = 0.004047 square kilometer

Common area conversion mistakes

  • A hectare is 10,000 m², a 100 × 100 m square, and one square kilometer holds 100 hectares. News stories about wildfires and land plots often mix the two up. Rule of thumb: a football pitch is roughly 0.7 hectares.
  • An acre is about 4,047 m², which is roughly 0.405 hectares, not the other way around. One hectare holds about 2.47 acres. Buying property abroad: multiply acres by 0.405 to get hectares.
  • For areas the length factor must be squared, using it directly is the classic trap. 1 km is 1,000 m, but 1 km² is 1,000,000 m², and 1 m² is 10,000 cm². The rule: convert the length unit, then square the factor.

Quick acre and square kilometer conversion quiz

Score: 0

3.1 acre equals 0.0125 square kilometer.

Correct answer: 3.1 acre = 0.0125 square kilometer.

250 acre equals 0.607 square kilometer.

Correct answer: 250 acre = 1.01 square kilometer.

21.4 square kilometer equals 2 640 acre.

Correct answer: 21.4 square kilometer = 5 290 acre.

208 square kilometer equals 51 400 acre.

Correct answer: 208 square kilometer = 51 400 acre.

0.1 square kilometer equals 37.1 acre.

Correct answer: 0.1 square kilometer = 24.7 acre.

More area conversions