Convert Acre to Square Kilometer
Use this free converter to change acres (ac) into square kilometers (km²). Acre and square kilometer both measure area. As a quick reference, 1 ac equals 0.0040468564 km², and 1 km² equals 247.10538 ac.
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Square Kilometer (km²)
0.0040468564
1 ac = 0.0040468564 km²
Area conversion table
| Acre | Square Kilometer |
|---|---|
| 0.01 | 0.000040468564 |
| 0.1 | 0.00040468564 |
| 0.5 | 0.0020234282 |
| 1 | 0.0040468564 |
| 2 | 0.0080937128 |
| 3 | 0.012140569 |
| 5 | 0.020234282 |
| 10 | 0.040468564 |
| 20 | 0.080937128 |
| 25 | 0.10117141 |
| 50 | 0.20234282 |
| 100 | 0.40468564 |
| 1,000 | 4.0468564 |
How to convert Acre to Square Kilometer
Multiply the acre value by 0.0040468564 to get square kilometers.
- Enter the number of acres you want to convert.
- The converter instantly shows the equivalent value in square kilometers.
- Worked example: 15 ac × 0.0040468564 = 0.060702846 km².
- Use the swap button to reverse the conversion (square kilometer to acre).
About these units
Acre (ac)
- Definition
- An acre (ac) is a unit of land area equal to 43,560 square feet, or about 4,047 square meters.
- History
- Originally the area a yoke of oxen could plough in a day, it was standardised in medieval England.
- Current use
- Acres measure farmland and real-estate plots in the US and UK.
Square Kilometer (km²)
- Definition
- A square kilometer (km²) is the area of a square one kilometer on each side, equal to 1,000,000 square meters.
- History
- It is a metric multiple of the square meter for large areas.
- Current use
- Square kilometers measure the area of cities, regions, lakes, and countries.
Frequently asked questions
How many square kilometers are in a acre?
There are 0.0040468564 km² in 1 ac. To convert, multiply the number of acres by 0.0040468564.
How do I convert acres to square kilometers?
Multiply the acre value by 0.0040468564 to get square kilometers. For example, 10 ac = 0.040468564 km².
Is this acre-to-square kilometer converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Acre to other area units
| Unit | 1 Acre equals |
|---|---|
| Square Meter (m²) | 4046.8564 m² |
| Square Kilometer (km²) | 0.0040468564 km² |
| Square Centimeter (cm²) | 40468564 cm² |
| Square Mile (mi²) | 0.0015625 mi² |
| Square Yard (yd²) | 4840 yd² |
| Square Foot (ft²) | 43560 ft² |
| Square Inch (in²) | 6272640 in² |
| Hectare (ha) | 0.40468564 ha |