Convert Acre (acre) to Square kilometer (km²) (km2)
Category: Area
1 acre = 0.004047 km2
High-precision rounding: 6 decimals
How to convert acre to square kilometer (km²)
We convert by pivoting through the SI base unit for Area and applying exact factors where applicable.
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Examples
Linear unit conversions use standardized factors; many are exact by definition (e.g., 1 in = 25.4 mm, 1 ft = 0.3048 m).
Common mistakes
- Squaring a length conversion factor incorrectly or forgetting to square it.
About Area
Area equals length squared. It appears in real estate, land management, material takeoffs, and GIS. Square meters are SI standard; acres and hectares are common for land reporting in different regions.
About Acre
Acre
Exactly 4,046.8564224 m². Traditional land area in US/UK real estate and agriculture.
History: Medieval origins as the area ploughable in a day; later standardized to a fixed metric value.
About Square kilometer (km²)
Square kilometer (km²) is a commonly used unit within the Area category.
Related conversions from acre
- acre → ha Hectare (ha)
- acre → ft2 Square foot (ft²)
- acre → m2 Square meter (m²)
- acre → yd2 Square yard (yd²)