Convert acre to square kilometer

1 ac = 0.004046856422 km²

1 ac = 0.0040469 km²
1 ac in every area unit
microbarn4.0469e+37 μb
millibarn4.0469e+34 mb
barn4.0469e+31 b
square nanometer4.0469e+21 nm²
square micrometer4.0469e+15 μm²
circular mil7,986,600,000,000 cmil
thousand circular mils7,986,600,000 kcmil
square millimeter4,046,900,000 mm²
square centimeter40,469,000 cm²
square inch6,272,600 in²
square decimeter404,690 dm²
square foot43,560 ft²
square yard4,840 yd²
square meter4,046.9 m²
tsubo1,224.2 tsubo
square rod160 rd²
are40.469 a
square chain10 ch²
dunam4.0469 dunam
rood4 rood
acre1 ac
hectare0.40469 ha
square kilometer0.0040469 km²
square mile0.0015625 mi²
How the conversion works

Multiply by 0.004046856422 to go from acre to square kilometer, or divide by it to go back. Every conversion on this site routes through the SI value (m²) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.

Going the other way? square kilometer to acre — 1 km² = 247.1053815 ac.

acre to square kilometer — common values
1 ac0.0040468564 km²
2 ac0.0080937128 km²
3 ac0.012140569 km²
5 ac0.020234282 km²
10 ac0.040468564 km²
15 ac0.060702846 km²
20 ac0.080937128 km²
25 ac0.10117141 km²
50 ac0.20234282 km²
75 ac0.30351423 km²
100 ac0.40468564 km²
250 ac1.0117141 km²
500 ac2.0234282 km²
1000 ac4.0468564 km²