Acre to Square Kilometer Converter

Convert Acre to Square Kilometer instantly — live results with exact conversion factors.

From

0.00404685642 km²

1 acre = 0.004046856422 square kilometers. To convert ac to km², multiply by 0.004046856422.

Quick Reference Table

Acre (ac)	Square Kilometer (km²)
1	0.00404685642
2	0.00809371284
5	0.020234282
10	0.040468564
20	0.080937128
50	0.20234282
100	0.40468564
250	1.01171411
500	2.02342821
1000	4.04685642

Formula

Convert Acre (ac) to Square Kilometer (km²) using the relationship:

km² = ac × 0.004046856422

How to Convert

Take the value in acres (ac).
Multiply it by 0.004046856422 (the conversion factor from ac to km²).
The result is the equivalent value in square kilometers (km²).
Example: 1 ac = 0.00404685642 km².

Reverse Conversion

Need it the other direction? Square Kilometer to Acre conversion.

All Area Conversions

See the full list of Area conversions.

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FAQ

▸ How many square kilometers are in 1 acre?

1 Acre equals 0.00404685642 square kilometers. Multiply by 0.004046856422 to convert ac to km².

▸ What is the formula to convert acre to square kilometer?

Multiply the value in acres by 0.004046856422 to get square kilometers. Formula: km² = ac × 0.004046856422.

▸ How do I convert acres to square kilometers easily?

Enter your value in the converter at the top of this page — the square kilometers result updates live as you type. You can also multiply by 0.004046856422 directly.

Answer