Acres to Square kilometres
Convert acres to square kilometres (acres to km²). 1 acres = 0.0040468564224 km². Use the calculator, formula and conversion table.
How to convert acres to square kilometres
Multiply the amount in acres by 0.0040468564224 to get square kilometres. The displayed factor and results are rounded to 12 significant digits.
km² = acres × 0.0040468564224Worked example
1 acres = 0.0040468564224 km². Change the amount in the calculator above to use your own value.
Units and assumptions
Area uses squared length factors: one square foot is exactly 0.09290304 square metres. Acres are international acres; hectares equal 10,000 square metres.
Calculator results use floating-point arithmetic and are rounded for display. The reference table below uses up to 12 significant digits.
Acres to Square kilometres table
| Acres (acres) | Square kilometres (km²) |
|---|---|
| 0 | 0 |
| 1 | 0.0040468564224 |
| 5 | 0.020234282112 |
| 10 | 0.040468564224 |
| 25 | 0.10117141056 |
| 100 | 0.40468564224 |
| 1,000 | 4.0468564224 |
About this conversion
What is the formula for acres to square kilometres?
km² = acres × 0.0040468564224. Multiply the amount in acres by 0.0040468564224 to get square kilometres. The displayed factor and results are rounded to 12 significant digits.
How do I convert back to acres?
Use the square kilometres to acres calculator to reverse this conversion. You can also use Swap units in the calculator above.
Can I use a different pair of units?
Choose another unit in the calculator, or open the area converter to browse all supported pairs.