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Area
Square kilometers to Acres
Convert square kilometers (km²) to acres (ac). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 km² = 247.11 ac
Square kilometers to Acres Conversion Table
Common values, ready to copy:
| square kilometers | acres |
|---|---|
| 1 km² | 247.11 ac |
| 2 km² | 494.21 ac |
| 5 km² | 1235.53 ac |
| 10 km² | 2471.05 ac |
| 25 km² | 6177.63 ac |
| 50 km² | 12355.26 ac |
| 100 km² | 24710.52 ac |
| 1,000 km² | 247105.16 ac |
Formula
acres = square kilometers × 2.47105163e+2
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
About Square kilometers and Acres
Square kilometers (km²): One kilometer squared, or one million square meters. Common uses: City area, national park sizes, agricultural land, and geographic features at the regional scale.
Acres (ac): An old English unit, originally the area a yoke of oxen could plow in a day; standardized at exactly 4,046.86 m² (43,560 sq ft). Common uses: Land area in the US, UK, and most former British colonies — farm sizes, residential lots, and ranch acreage.
How the conversion works
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
The exact relationship is acres = square kilometers × 2.47105163e+2, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between square kilometers and acres comes up wherever area measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.