Square kilometers to square miles
1 square kilometer = 0.386102 square miles
Type a value in square kilometers (km²) to get square miles (sq mi) straight away. A square kilometer is smaller than a square mile, so the number goes down. Both units belong to area, measured here against the square meter.
1 km² = 0.38610216 sq mi
Formula
sq mi = km² × 0.38610216
One square kilometer is 0.38610216 square miles, so multiply by that factor. You can also divide by 2.58999, the number of square kilometers in one square mile. Here km² is the value in square kilometers and sq mi is the result in square miles.
Worked example: 5 square kilometers × 0.38610216 = 1.93051 square miles.
Square kilometers to square miles table
| square kilometers (km²) | square miles (sq mi) |
|---|---|
| 1 km² | 0.386102 sq mi |
| 2 km² | 0.772204 sq mi |
| 3 km² | 1.15831 sq mi |
| 4 km² | 1.54441 sq mi |
| 5 km² | 1.93051 sq mi |
| 6 km² | 2.31661 sq mi |
| 7 km² | 2.70272 sq mi |
| 8 km² | 3.08882 sq mi |
| 9 km² | 3.47492 sq mi |
| 10 km² | 3.86102 sq mi |
| 15 km² | 5.79153 sq mi |
| 20 km² | 7.72204 sq mi |
| 25 km² | 9.65255 sq mi |
| 30 km² | 11.5831 sq mi |
| 40 km² | 15.4441 sq mi |
| 50 km² | 19.3051 sq mi |
| 60 km² | 23.1661 sq mi |
| 75 km² | 28.9577 sq mi |
| 100 km² | 38.6102 sq mi |
Everyday square kilometers in square miles
| What it is | km² | sq mi |
|---|---|---|
| 100 hectares | 1 km² | 0.386102 sq mi |
| Central Park, New York | 3.41 km² | 1.31661 sq mi |
| a small city | 100 km² | 38.6102 sq mi |
| Delhi (NCT) | 1,484 km² | 572.976 sq mi |
| Mumbai city and suburbs (about) | 603 km² | 232.82 sq mi |
Quick estimate in your head
Multiply by about 0.39. For 5 km² that gives 1.95 sq mi against an exact 1.93051 sq mi, an error of 1.0%.
About the units
Square kilometer (km²). 1,000,000 m² or 100 hectares. Used for city and country areas.
Square mile (sq mi). 640 acres, about 2.59 km². Used for land area in the US.
Going the other way, 1 square mile is 2.58999 square kilometers.
Questions
How many square miles are in 1 square kilometer?
1 square kilometer is 0.386102 square miles, and 1 square mile is 2.58999 square kilometers.
How do I convert square kilometers to square miles?
Use sq mi = km² × 0.38610216. For example, 5 square kilometers × 0.38610216 = 1.93051 square miles.
Is the square kilometer to square mile factor exact?
The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.
How much is Mumbai city and suburbs in square miles?
603 km² is 232.82 sq mi.
Source for the conversion factor: NIST Handbook 44, Appendix C (units of area).
Related conversions
- square miles to square kilometers
- square kilometers to hectares
- square meters to square feet
- square feet to square meters
- square yards to square feet
- square feet to square yards