Square mile to Square kilometer Converter
Convert square miles to square kilometers with this free area converter. The exact relationship used on this page is 1 square mile = 2.58998811034 square kilometers. Type any number — the result updates instantly, works on phones and desktops, and is ready to copy into homework, a spec sheet, or a shopping list.
Formula: Square kilometer = Square mile × 2.58998811034
How to convert square miles to square kilometers
- Enter the value in square miles in the converter.
- Read the equivalent amount in square kilometers.
- Use the swap link if you need square kilometer to square mile instead.
- Check the table for common values without typing.
Worked examples
- 1 mi² = 2.58998811 km²
- 5 mi² = 12.94994055 km²
- 10 mi² = 25.8998811 km²
- 25 mi² = 64.74970276 km²
Conversion table
Common square miles values converted to square kilometers.
| mi² | km² |
|---|---|
| 1 | 2.58998811 |
| 2 | 5.179976221 |
| 3 | 7.769964331 |
| 4 | 10.35995244 |
| 5 | 12.94994055 |
| 6 | 15.53992866 |
| 7 | 18.12991677 |
| 8 | 20.71990488 |
| 9 | 23.30989299 |
| 10 | 25.8998811 |
| 20 | 51.79976221 |
| 50 | 129.4994055 |
| 100 | 258.998811 |
| 250 | 647.4970276 |
| 500 | 1,294.994055 |
| 1,000 | 2,589.98811 |
About this conversion
Square mile (mi²) and Square kilometer (km²) are both area units. Area converters help with flooring, land, real estate listings, and fabric. Bookmark this URL when you convert square miles to square kilometers often, then explore related pairs in the same category if you need a different target unit.
Need the other direction? Open the square kilometer to square mile converter.
FAQ
How many square kilometers are in 1 square mile?+
1 square mile equals 2.58998811034 square kilometers.
What is the formula to convert square miles to square kilometers?+
Square kilometer = Square mile × 2.58998811034
How do I convert square miles to square kilometers by hand?+
Multiply the square mile value by 2.58998811034. Example: 10 square miles × 2.58998811034 = 25.8998811034 square kilometers.
Is this mi² to km² converter accurate?+
Yes. Linear conversions use internationally agreed factors relative to SI. Temperature and inverse fuel units use the standard offset or reciprocal formulas, not a guessed scale factor.