Acres to Square Kilometers converter
Convert acres (ac) to square kilometers (km²) — results update instantly as you type.
Acres to Square Kilometers
To
1 ac = 0.00404686 km²
Advertisement · In-content
How to convert Acres to Square Kilometers
Area measurements describe surfaces — from apartment floor plans in square meters or square feet to farmland in acres and hectares, and entire countries in square kilometers or square miles.
Every area unit is a length unit squared, which is why conversion factors are large: one acre equals exactly 4,046.8564224 square meters and one hectare is exactly 10,000 square meters.
Formula
ac × 0.0040468564 = km²
Multiply your acres value by 0.0040468564 to get square kilometers. For the reverse, divide by the same factor.
Acres to Square Kilometers conversion table
| Acres | Square Kilometers |
|---|---|
| 1 ac | 0.004047 km² |
| 2 ac | 0.008094 km² |
| 5 ac | 0.020234 km² |
| 10 ac | 0.040469 km² |
| 25 ac | 0.101171 km² |
| 100 ac | 0.404686 km² |
Common use cases
- Real estate listings between square feet and square meters
- Farmland and plots between acres and hectares
- Country and city size comparisons
- Construction material coverage estimates
Frequently asked questions
One acre equals 43,560 square feet, or about 4,047 square meters — roughly 90% of an American football field.