Square Miles to Square Kilometers
Convert mi² to km² quickly with this free online calculator. The page explains the conversion rule, gives practical examples and provides a quick reference table.
1 square mile equals 2.589988110336 square kilometers.
How to use the Square Miles to Square Kilometers
- Enter the number you want to convert.
- Confirm the source unit shown beside the input.
- Choose decimal precision if you need more or less detail.
- Read the converted result.
- Copy the result when you need to use it elsewhere.
How the conversion works
1 square mile equals 2.589988110336 square kilometers.
For a simple fixed-factor conversion, the calculator multiplies the entered value by the stated factor. Temperature scales and certain specialized tools use their specific mathematical relationship instead.
Common mi² to km² conversions
| mi² | km² |
|---|---|
| 1 mi² | 2.589988 km² |
| 2 mi² | 5.179976 km² |
| 5 mi² | 12.949941 km² |
| 10 mi² | 25.899881 km² |
| 20 mi² | 51.799762 km² |
| 50 mi² | 129.499406 km² |
Example
For example, entering 1 mi² gives approximately 2.589988 km² using the rule above. Change the input to test your own value.
Frequently asked questions
Accuracy note: This calculator is a practical reference. For regulated, safety-critical or specialized work, verify the result against the applicable standard.
Page reviewed: August 24, 2026.