Convert Acres to Square Kilometers
ac to km² · area conversion
What are acres and square kilometers?
An acre is 43,560 square feet (about 4,047 m²), the traditional unit for land area. A square kilometer is one million square meters, used for large regions and cities. For scale: a tennis court is about 261 m² (2,808 ft²), and a soccer pitch is roughly 0.7 hectares.
How to convert acres to square kilometers
1 ac = 0.00404686 km². To convert, multiply the number of acres by 0.00404686. For example, 5 ac = 0.0202343 km², and 20 ac = 0.0809371 km². To go the other way, multiply square kilometers by 247.105 (since 1 km² = 247.105 ac).
Acres to Square Kilometers conversion table
| Acres (ac) | Square Kilometers (km²) |
|---|---|
| 1 | 0.00404686 |
| 5 | 0.0202343 |
| 10 | 0.0404686 |
| 25 | 0.101171 |
| 50 | 0.202343 |
| 100 | 0.404686 |
| 1,000 | 4.04686 |
FAQ
What is 1 ac in km²?
1 ac = 0.00404686 km². To convert any amount, multiply the number of acres by 0.00404686.
How do I convert square kilometers back to acres?
Go the other way: 1 km² = 247.105 ac, so multiply square kilometers by 247.105 to get acres.
Is a acre bigger than a square kilometer?
No — 1 ac is the smaller unit, equal to 0.00404686 km² (it takes 247.105 ac to make one km²).
Are these area conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.