Square Mile to Square Kilometer Conversion
1 Square Mile (mi²) equals 2.58998811 Square Kilometer (km²).
1 Square Mile = 2.58998811 Square Kilometer
How to convert Square Mile to Square Kilometer
Multiply the value in Square Mile by 2.58998811 to get Square Kilometer. To convert back from Square Kilometer to Square Mile, divide by 2.58998811 — or multiply by 0.3861021586.
km² = mi² × 2.58998811
Example: 25 mi² × 2.58998811 = 64.74970275 km².
Watch out: Area units scale with the square of length units. One metre is 100 centimetres, but one square metre is 10,000 square centimetres — a frequent source of errors.
Square Mile to Square Kilometer conversion table
| Square Mile (mi²) | Square Kilometer (km²) |
|---|---|
| 1 | 2.58998811 |
| 2 | 5.17997622 |
| 3 | 7.76996433 |
| 4 | 10.35995244 |
| 5 | 12.94994055 |
| 10 | 25.8998811 |
| 15 | 38.84982165 |
| 20 | 51.7997622 |
| 25 | 64.74970275 |
| 50 | 129.4994055 |
| 75 | 194.2491083 |
| 100 | 258.998811 |
| 250 | 647.4970275 |
| 500 | 1,294.994055 |
| 1,000 | 2,589.98811 |
Frequently asked questions
What is 1 Square Mile in Square Kilometer?
1 Square Mile (mi²) is 2.58998811 Square Kilometer (km²).
What is 1 Square Kilometer in Square Mile?
1 Square Kilometer (km²) is 0.3861021586 Square Mile (mi²).
How do I convert Square Mile to Square Kilometer?
Multiply the value in Square Mile by 2.58998811. For example, 5 mi² × 2.58998811 = 12.94994055 km². To go the other way, divide by 2.58998811.
How many units does the area converter support?
It converts between 10 units: Square Meter, Square Kilometer, Square Centimeter, Square Millimeter, Hectare, Acre, Square Mile, Square Yard, Square Foot, Square Inch.
What should I watch out for when converting area?
Area units scale with the square of length units. One metre is 100 centimetres, but one square metre is 10,000 square centimetres — a frequent source of errors.
More area conversions
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For any other area unit, use the full Area Converter.