Acres to Square Kilometers Converter
Convert acres (ac) to square kilometers (km²), with the formula, a conversion table and exact factors.
Change the values and press Calculate to work out your own figures.
Enter an area, choose its unit and the unit you want. The answer is exact until it is shown, and the same value appears in every other unit.
Show the working
- 1 ac = 0.0040468564224 km²
- 1 × 0.0040468564224 = 0.0040468564224 km²
How to convert acres to square kilometers
1 ac = 0.0040468564224 km², so multiply by 0.0040468564224 to go from acres to square kilometers. Going the other way, 1 km² = 247.105381467 ac.
km² = ac × 0.0040468564224 ac = km² × 247.105381467
Worked example:
1 ac = 0.0040468564224 km² 5 × 0.0040468564224 = 0.020234282112 km²
Acres to square kilometers table
| Acres | Square Kilometers |
|---|---|
| 1 ac | 0.0040468564224 km² |
| 2 ac | 0.0080937128448 km² |
| 3 ac | 0.0121405692672 km² |
| 4 ac | 0.0161874256896 km² |
| 5 ac | 0.020234282112 km² |
| 6 ac | 0.0242811385344 km² |
| 7 ac | 0.0283279949568 km² |
| 8 ac | 0.0323748513792 km² |
| 9 ac | 0.0364217078016 km² |
| 10 ac | 0.040468564224 km² |
| 15 ac | 0.060702846336 km² |
| 20 ac | 0.080937128448 km² |
| 25 ac | 0.10117141056 km² |
| 30 ac | 0.121405692672 km² |
| 40 ac | 0.161874256896 km² |
| 50 ac | 0.20234282112 km² |
| 75 ac | 0.30351423168 km² |
| 100 ac | 0.40468564224 km² |
| 250 ac | 1.0117141056 km² |
| 500 ac | 2.0234282112 km² |
| 1000 ac | 4.0468564224 km² |
About the units
- Acres (ac)
- Acres, a US customary unit. Definition: NIST Handbook 44 Appendix C (1 acre = 43,560 sq ft, international-foot based).
- Square Kilometers (km²)
- Square kilometers, a metric unit. Definition: BIPM SI Brochure (SI prefixes).