Convert Acres to Square Kilometers
One acre equals 0.004047 square kilometers. Type any value to convert acres to square kilometers instantly — with a full reference table below.
Convert Acres to Square Kilometers
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Conversion formula
To convert acres to square kilometers, multiply by 0.004047. One acre equals 0.004047 km², and one square kilometer equals 247.105381 ac.
Acres to Square Kilometers table
About converting Acres to Square Kilometers
Acres (ac) and Square Kilometers (km²) are both units of area. The exact factor is 1 ac = 0.004047 km², so multiply by 0.004047 to go from acres to square kilometers (or divide to go back).
The conversion is exact and runs entirely in your browser. Need the reverse? Use the Square Kilometers to Acres converter, or the full unit converter for every unit at once.
Frequently asked questions
How many square kilometers are in one acre?
One acre equals 0.004047 square kilometers.
How do I convert acres to square kilometers?
Multiply the number of acres by 0.004047. For example, 10 acres = 0.040469 square kilometers.
What is 5 acres in square kilometers?
5 acres is 0.020234 square kilometers.