Acres to square kilometers (ac to km²): converter and chart

How to convert acres to square kilometers

Formula: km² = ac × 0.00404686

Worked example: 5 ac → 5 × 0.00404686 = 0.0202343 km²

Acres to square kilometers conversion chart

Acres (ac)	Square kilometers (km²)
1 ac	0.00404686 km²
2 ac	0.00809371 km²
3 ac	0.0121406 km²
4 ac	0.0161874 km²
5 ac	0.0202343 km²
6 ac	0.0242811 km²
7 ac	0.028328 km²
8 ac	0.0323749 km²
9 ac	0.0364217 km²
10 ac	0.0404686 km²
12 ac	0.0485623 km²
15 ac	0.0607028 km²
20 ac	0.0809371 km²
25 ac	0.101171 km²
30 ac	0.121406 km²
40 ac	0.161874 km²
50 ac	0.202343 km²
75 ac	0.303514 km²
100 ac	0.404686 km²
250 ac	1.01171 km²
500 ac	2.02343 km²
1,000 ac	4.04686 km²

What is an acre?

The acre equals 43,560 square feet, about 4,047 m² or 0.405 hectare. It is the US and UK unit for land, lots and farms. An American football field, end zones included, covers about 1.32 acres.

What is a square kilometer?

The square kilometer equals one million square meters, or 100 hectares. It measures cities, lakes, parks and countries; Manhattan covers about 59 km² of land. One square kilometer is about 0.386 square mile.

Frequently asked questions

How many square kilometers are in an acre?

An acre equals 0.00404686 square kilometers. To convert any value, multiply the number of acres by 0.00404686.

How do you convert acres to square kilometers?

Use the formula km² = ac × 0.00404686. Example: 5 ac → 5 × 0.00404686 = 0.0202343 km².

How many acres are in a square kilometer?

A square kilometer equals 247.105 acres. That is the reverse conversion, from square kilometers to acres.

Results are rounded to 6 significant digits; the conversion factors are the exact legal definitions.

Convert acres to square kilometers (ac to km²)