Acre to Square Kilometer
Convert ac to km² instantly — free, no sign-up.
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About the Acre (ac)
The Acre is historically the area a yoke of oxen could plow in a day, still the standard for land and farmland in the US and UK.
About the Square Kilometer (km²)
The Square Kilometer is equal to one million square meters, used for city, country, and large land-area measurements.
How to convert ac to km²
- Enter the value in ac in the box above.
- The km² equivalent updates instantly.
- Use the swap button to convert km² back to ac just as easily.