Square Miles to Square Kilometres Converter
Type a value in square miles to see it in square kilometres. It works both ways: type in the square kilometres box to convert back.
Formula
To convert square miles to square kilometres, multiply by 2.58998811.
1 mi² = 2.58998811034 km² and 1 km² = 0.386102158542 mi².
Square miles to square kilometres table
| Square miles | Square kilometres |
|---|---|
| 1 mi² | 2.589988 km² |
| 2 mi² | 5.179976 km² |
| 5 mi² | 12.94994 km² |
| 10 mi² | 25.89988 km² |
| 50 mi² | 129.4994 km² |
| 100 mi² | 258.9988 km² |
| 500 mi² | 1,294.994 km² |
| 1,000 mi² | 2,589.988 km² |
Worked examples
2 mi² in square kilometres
2 mi²
5.179976 km²
2 × 2.58998811 = 5.179976221
50 mi² in square kilometres
50 mi²
129.4994 km²
50 × 2.58998811 = 129.4994055
500 mi² in square kilometres
500 mi²
1,294.994 km²
500 × 2.58998811 = 1,294.994055
About Square Miles to Square Kilometres Converter
This converter turns square miles into square kilometres as you type, and works the other way too: type in the square kilometres box to convert back. To convert square miles to square kilometres, multiply by 2.58998811. For example, 2 mi² is 5.179976 km², and 50 mi² is 129.4994 km².
Area is length squared, so the factor between two area units is the square of the factor between the matching length units. That is why a square metre is not 3.28 but about 10.76 square feet. Both units have exact definitions, so the converter gives an exact result, rounded only for display. Use the table below for common values, or set the decimal places to round the answer for a form or a label.
How to use Square Miles to Square Kilometres Converter
- Type the amount in square miles in the first box.
- Read the answer in square kilometres in the second box and in the result line below.
- To convert the other way, type in the square kilometres box instead, or use the swap button to open the square kilometres to square miles page.
- Choose a number of decimal places if you need a rounded figure, then copy the result line.
Common uses
- Ordering flooring, turf or paving
- Understanding farmland and plot sizes
- Checking room sizes on a floor plan
- Comparing floor areas in property listings
Frequently asked questions
How many square kilometres are in one square mile?
There are 2.58998811 square kilometres in one square mile. This figure is exact, because both units have fixed definitions.
How do I convert square miles to square kilometres?
To convert square miles to square kilometres, multiply by 2.58998811. For example, 500 mi² is 1,294.994 km².
How do I convert square kilometres to square miles?
Going the other way, divide by 2.58998811 (the same as multiplying by 0.3861021585). The square kilometres to square miles converter does this for you.
What is 50 mi² in square kilometres?
50 mi² is 129.4994 km².
Why is the area factor so much bigger than the length factor?
Area multiplies two lengths together, so the length factor is applied twice. One metre is about 3.2808 feet, so one square metre is about 3.2808 × 3.2808 = 10.764 square feet.