Convert Square Miles to Square Kilometers (mi² to km²)
Instantly convert square miles to square kilometers with this free online converter. Type a value below and the result updates in real time. All calculations run in your browser, nothing is sent to a server.
Square Miles to Square Kilometers Formula
km² = mi² x 2.589988
Multiply the square miles value by 2.589988 to get square kilometers.
Common Square Miles to Square Kilometers Conversions
| Square Miles (mi²) | Square Kilometers (km²) |
|---|---|
| 0.1 mi² | 0.258999 km² |
| 0.25 mi² | 0.647497 km² |
| 0.5 mi² | 1.294994 km² |
| 1 mi² | 2.589988 km² |
| 2 mi² | 5.179976 km² |
| 5 mi² | 12.94994 km² |
| 10 mi² | 25.89988 km² |
| 25 mi² | 64.7497 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
How to Convert Square Miles to Square Kilometers
- Enter the square miles value in the input field above.
- The square kilometers result appears instantly as you type.
- Click the copy button to copy the result to your clipboard.
- To convert in the other direction, click the Swap button or visit the Square Kilometers to Square Miles converter.
Frequently Asked Questions
How many square kilometers are in one square mile?
One square mile equals 2.589988 km². Use the converter above for any value.
What is the formula to convert mi² to km²?
The formula is: km² = mi² x 2.589988. Multiply the square miles value by 2.589988 to get square kilometers.
How do I convert square kilometers back to square miles?
Use our reverse converter: Square Kilometers to Square Miles. You can also click the "Swap" button above the converter.
Is this converter accurate?
Yes. This converter uses the standard conversion factor and handles up to 8 decimal places of precision. All calculations run instantly in your browser with no rounding shortcuts.
Do I need to sign up to use this converter?
No. This converter is completely free with no signup, no account, and no usage limits. Your data never leaves your browser.
About This Tool
- Tool
- FreeToolPark Square Miles to Square Kilometers Converter
- Type
- Free online tool, no signup required
- Domain Expertise
- Unit conversion, measurement systems, data format conversion
- Privacy
- 100% client-side, no data stored
- Description
- Free square miles to square kilometers converter. Instantly convert mi² to km² with a reference table of common values. No signup, runs in your browser.
Cite This Tool
FreeToolPark. "Square Miles to Square Kilometers Converter." FreeToolPark, 2026, www.freetoolpark.com/tools/convert/sqmi-to-sqkm. Accessed April 14, 2026.