Square Kilometres to Square Miles Converter
1 square kilometre = 0.386102 square miles.
Enter a value
Result
1 square kilometre =
0.386102 mi²
1 km² × 0.386102 = 0.386102 mi²
1 ft² = 0.09290304 m² exactly
The working
- 1. Convert 1 km² to square metres: 1 × 1,000,000 = 1,000,000.
- 2. Convert to mi²: 1,000,000 ÷ 2,589,990 = 0.386102.
1 km² in every unit
Sizes for scale
- Studio flat
- 37 m² (400 ft²)
- Tennis court
- 261 m²
- Football pitch
- 7,140 m²
- One acre
- 4,047 m²
Conversion table
Square kilometres to Square miles
| Square kilometres | Square miles |
|---|---|
| 1 | 0.3861 |
| 2 | 0.7722 |
| 3 | 1.1583 |
| 4 | 1.5444 |
| 5 | 1.9305 |
| 6 | 2.3166 |
| 7 | 2.7027 |
| 8 | 3.0888 |
| 9 | 3.4749 |
| 10 | 3.861 |
| 15 | 5.7915 |
| 20 | 7.722 |
| 25 | 9.6526 |
| 50 | 19.305 |
| 100 | 38.61 |
Square miles to Square kilometres
| Square miles | Square kilometres |
|---|---|
| 1 | 2.59 |
| 2 | 5.18 |
| 3 | 7.77 |
| 4 | 10.36 |
| 5 | 12.95 |
| 6 | 15.54 |
| 7 | 18.13 |
| 8 | 20.72 |
| 9 | 23.31 |
| 10 | 25.9 |
| 15 | 38.85 |
| 20 | 51.8 |
| 25 | 64.75 |
| 50 | 129.5 |
| 100 | 259 |
Formula and worked example
square miles = square kilometres × 0.3861021585.
Convert 100 square kilometres to square miles: 100 × 0.38610216 = 38.6102 mi².
When you need this
Used to compare the sizes of cities, countries, lakes and national parks between metric and imperial sources.
Questions people ask
How many square miles are in a square kilometre?
One square kilometre is 0.38610216 square miles.
How do I convert square kilometres to square miles?
Multiply the number of square kilometres by 0.38610216, or divide by 2.5899881.
What is 10 km² in mi²?
10 square kilometres is 3.86102 square miles.
How do I convert square miles back to square kilometres?
Multiply by 2.5899881: one square mile is 2.5899881 square kilometres.
Related conversions
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: NIST Special Publication 811, Guide for the Use of the International System of Units.
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