About the Square Kilometer Converter
Convert square kilometers (km²) to square miles (mi²) instantly. Includes the exact conversion factor, formula and a quick reference table.
Also known as: km² to mi², Square kilometers to Square miles, convert Square kilometers to Square miles, km2 to mi2, sq km to sq mi, km2 to miles2.
How to use this calculator
- Enter value in square kilometers.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Open “Step-by-step” to see how the answer was worked out.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
mi² = km² × 0.3861021585
Worked example
Using the values pre-filled in the calculator above:
- Value in square kilometers = 1 km²
the calculator returns:
- Square miles: 0.386102 mi²
- Square millimeters: 1,000,000,000,000 mm²
- Square centimeters: 10,000,000,000 cm²
- Square meters: 1,000,000 m²
Working
1 km² × 0.3861021585 = 0.38610216 mi²