Convert Acre (ac) to Square Kilometer (km²)
To convert Acre to Square Kilometer, multiply the value by 0.004047. For example, 1 Acre = 0.004047 km² and 10 Acre = 0.040469 km². Both Acre and Square Kilometer are units of Area. Enter any value above for an instant, accurate result.
One Acre equals 0.004047 km².
Use the formula: km² = ac × 0.004047.