Conversion

Acres to Square Kilometers Converter

1 acre = 0.004046856422 km². Enter any value to convert acres (ac) to square kilometers (km²), or use the table below for common values.

Results

1 ac =0.004046856422 km²acres → square kilometers

1 ac0.004046856422 km²

1 km²247.1053815 ac

Formula: km² = ac × 0.004046856422

1 ac in other units

1 ac in other units
Unit	Value
square meters (m²)	4,046.856422
square kilometers (km²)	0.004046856422
square inches (in²)	6,272,640
square feet (ft²)	43,560
square yards (yd²)	4,840
square miles (mi²)	0.0015625
hectares (ha)	0.4046856422

Formula

km² = ac × 0.004046856422

Example: 10 ac = 0.04046856422 km². To convert the other way, use ac = km² × 247.1053815.

Quick mental estimate: multiply by about 0.004.

Acres to Square Kilometers conversion table

Acres (ac)	Square Kilometers (km²)
1 ac	0.004046856422 km²
2 ac	0.008093712845 km²
3 ac	0.01214056927 km²
4 ac	0.01618742569 km²
5 ac	0.02023428211 km²
6 ac	0.02428113853 km²
7 ac	0.02832799496 km²
8 ac	0.03237485138 km²
9 ac	0.0364217078 km²
10 ac	0.04046856422 km²
15 ac	0.06070284634 km²
20 ac	0.08093712845 km²
25 ac	0.1011714106 km²
30 ac	0.1214056927 km²
40 ac	0.1618742569 km²
50 ac	0.2023428211 km²
75 ac	0.3035142317 km²
100 ac	0.4046856422 km²
250 ac	1.011714106 km²
500 ac	2.023428211 km²
1,000 ac	4.046856422 km²

About acres and square kilometers

The acre is 43,560 square feet (about 4,047 m²), the traditional unit for farmland and building plots in the US and UK.

The square kilometer equals one million square meters, used for the areas of cities, countries and lakes.

Other Area conversions

Square Kilometers → AcresReverse conversion Square Meters → Square Kilometersm² → km² Square Inches → Square Kilometersin² → km² Square Feet → Square Kilometersft² → km² Square Yards → Square Kilometersyd² → km² Square Miles → Square Kilometersmi² → km² Acres → Square Metersac → m² Acres → Square Inchesac → in² Acres → Square Feetac → ft² Acres → Square Yardsac → yd² Acres → Square Milesac → mi² Acres → Hectaresac → ha Hectares → Square Kilometersha → km²

Frequently asked questions

How do I convert acres to square kilometers?

Use the formula km² = ac × 0.004046856422. For example, 10 ac = 0.04046856422 km².

What is 1 acre in square kilometers?

1 ac = 0.004046856422 km².

How do I convert square kilometers back to acres?

Use ac = km² × 247.1053815. 1 km² = 247.1053815 ac.