Square Kilometers to Square Miles converter
Convert square kilometers (km²) to square miles (mi²) — results update instantly as you type.
Square Kilometers to Square Miles
To
1 km² = 0.38610216 mi²
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How to convert Square Kilometers to Square Miles
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
km² × 0.3861021585 = mi²
Multiply your square kilometers value by 0.3861021585 to get square miles. For the reverse, divide by the same factor.
Square Kilometers to Square Miles conversion table
| Square Kilometers | Square Miles |
|---|---|
| 1 km² | 0.386102 mi² |
| 2 km² | 0.772204 mi² |
| 5 km² | 1.930511 mi² |
| 10 km² | 3.861022 mi² |
| 25 km² | 9.652554 mi² |
| 100 km² | 38.610216 mi² |
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.