AREA CONVERSION
Square mile to Square kilometer.
Convert square mile (mi²) to square kilometer (km²), with the math explained.
1 mi² = 2.58998811 km²
THE MATH, MADE SIMPLE
How to convert square mile to square kilometer
Multiply your square mile value by 2.58998811034 to get the equivalent in square kilometer. Both units are normalized through the square meter.
km² = mi² × 2.5899881110 mi² = 25.8998811034 km²
Result rounded to 12 significant digits. Change the precision in the calculator to suit your task.QUICK REFERENCE
mi² to km² conversion table
| Square mile (mi²) | Square kilometer (km²) |
|---|---|
| 1 mi² | 2.58998811034 km² |
| 2 mi² | 5.17997622067 km² |
| 5 mi² | 12.9499405517 km² |
| 10 mi² | 25.8998811034 km² |
| 20 mi² | 51.7997622067 km² |
| 50 mi² | 129.499405517 km² |
| 100 mi² | 258.998811034 km² |
| 500 mi² | 1,294.99405517 km² |
| 1,000 mi² | 2,589.98811034 km² |
About the square mile
The square mile (mi²) is a unit of area. One square mile equals 2,589,988.11034 square meter (base unit) in this calculator.
All square mile conversionsAbout the square kilometer
The square kilometer (km²) is a unit of area. One square kilometer equals 1,000,000 square meter (base unit) in this calculator.
All square kilometer conversionsCommon questions
What is 1 mi² in km²?
One square mile equals 2.58998811034 km². Use the formula above for other values.
Why might another calculator show a different last digit?
Calculators may round at different stages or use different unit conventions. We keep full JavaScript numeric precision during calculation and round only for display. Choose up to 15 significant digits. Check US versus UK units and the notes for this category.
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