Acres to Square Kilometers Converter
Convert ac to km² instantly. 1 ac = 0.004046856422 km².
Conversion Formula
km² = ac × 0.004046856422
Example
25 ac × 0.004046856422 = 0.1011714106 km²
Convert the other way: Square Kilometers to Acres →
Acres to Square Kilometers Conversion Table
| Acres (ac) | Square Kilometers (km²) |
|---|---|
| 0.1 | 0.000404685642 |
| 0.5 | 0.002023428211 |
| 1 | 0.004046856422 |
| 2 | 0.008093712845 |
| 5 | 0.02023428211 |
| 10 | 0.04046856422 |
| 20 | 0.08093712845 |
| 25 | 0.1011714106 |
| 50 | 0.2023428211 |
| 100 | 0.4046856422 |
| 500 | 2.023428211 |
| 1,000 | 4.046856422 |
About These Units
- Acres (ac)
- Exactly 43,560 square feet, about 4,046.86 m², and historically about a day's ploughing with oxen. Acres measure farms, house lots, and land sales in the United States and United Kingdom.
- Square Kilometers (km²)
- The area of a square 1 km on each side, exactly 1,000,000 m² or 100 hectares. It is used for the areas of countries, cities, lakes, and wildfires, and equals about 0.386 square miles.
Frequently Asked Questions
How many km² are in 1 ac?
1 ac equals 0.004046856422 km².
How do I convert Acres to Square Kilometers?
Multiply your Acres value by 0.004046856422. For example, 25 ac × 0.004046856422 = 0.1011714106 km².
How many ac are in 1 km²?
1 km² equals 247.1053815 ac.