Convert Square Kilometres to Acres (km2 to ac)
1 square kilometre (km²) = 247.1053815 acres (ac). 1 ac = 0.004046856422 km². Example: 15 km² = 15 × 247.1053815 = 3706.580722 ac.
Also searched as square kilometres to ac, square kilometres in ac, square kilometres into acres, km2 to ac, km2 in acres, km2 into acre, square kilometre to acre, km2 to acres converter, square kilometers to acres and how many acres in a square kilometre.
1 km² = 247.1053815 ac
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square kilometre to acre converter to paste a column from Excel.
How to Convert Square Kilometre to Acre
- 1 km² = 247.1053815 ac
- 1 ac = 0.004046856422 km²
- Example: convert 15 km² to ac: 15 km² = 15 × 247.1053815 ac = 3706.580722 ac
Formula
ac = km² × 247.1053814672
Derivation from SI units:
- 1 km² = (1000 m)² = 10⁶ m² = 100 ha
- 1 acre = 43 560 ft² = 4 046.856 422 4 m² (international foot; the US survey foot was retired at the end of 2022)
- 1 km² = 1000000 m² ÷ 4046.8564224 m² per ac = 247.1053814672 ac
Both units are defined exactly, so the factor is exact. Square Kilometre definition: square kilometre; Acre definition: acre.
Worked examples
- A reading of 2 km² converts to 494.2107629 ac.
2 km² × 247.1053815 = 494.2107629 ac - A value of 50 km² is 12355.26907 ac.
50 km² × 247.1053815 = 12355.26907 ac
Square Kilometre to Acre conversion table
| Square Kilometres (km²) | Acres (ac) |
|---|---|
| 0.01 km² | 2.471053815 ac |
| 0.1 km² | 24.71053815 ac |
| 0.5 km² | 123.5526907 ac |
| 1 km² | 247.1053815 ac |
| 2 km² | 494.2107629 ac |
| 5 km² | 1235.526907 ac |
| 10 km² | 2471.053815 ac |
| 25 km² | 6177.634537 ac |
| 50 km² | 12355.26907 ac |
| 100 km² | 24710.53815 ac |
| 1000 km² | 247105.3815 ac |
| 10000 km² | 2471053.815 ac |
Where it's used
Square Kilometres are used for city, lake and country areas, while acres appear in US, UK and Indian land and property listings. Both measure area, so the conversion is a fixed factor.
Square Kilometre to other area units
| Conversion | 1 km² equals |
|---|---|
| square kilometre to acre | 247.1053815 ac |
| square kilometre to square meter | 1000000 m² |
| square kilometre to square centimeter | 10000000000 cm² |
| square kilometre to square foot | 10763910.42 ft² |
| square kilometre to square inch | 1550003100 in² |
| square kilometre to hectare | 100 ha |
| square kilometre to square millimeter | 1000000000000 mm² |
| square kilometre to square yard | 1195990.046 yd² |
Show 1 more units
| square kilometre to square mile | 0.3861021585 mi² |
|---|
Frequently asked questions
How many acres are in 1 square kilometre?
1 km² = 247.1053815 ac.
How do I convert square kilometres to acres?
Multiply the value in km² by 247.1053815. For example, 15 km² × 247.1053815 = 3706.580722 ac.
Is the km² to ac conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement, National Institute of Standards and Technology , Appendix C, units of area.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Square Kilometres to Acres (km2 to ac). Retrieved October 25, 2026, from https://scientificconverters.com/area/square-kilometers-to-acres/
IEEE
Scientific Converters, "Convert Square Kilometres to Acres (km2 to ac)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/area/square-kilometers-to-acres/