Square Kilometer to Square Mile
1 km² = 0.3861 mi²
Convert Square Kilometer (km²) to Square Mile (mi²) with engineering-grade precision. Instant results, formula, and reference table below.
1 Square Kilometer ≈0.3861021585 Square Mile
How to convert Square Kilometer to Square Mile (km² to mi²)
Converting Square Kilometers to Square Miles is critical for developers working with international data standards or scientific applications. This tool performs the calculation entirely on your client (browser) using JavaScript/WASM, ensuring zero latency and maximum privacy.
The Formula
1 km² = 0.386102 mi²
Calculation Example
Let's say you want to convert 5 km² to mi²:
- Input: 5 km²
- Calculation: 5 × 0.386102
- Result: 1.9305 mi²
About the Square Kilometer to Square Mile conversion
The conversion factor from Square Kilometer (km²) to Square Mile (mi²) is 0.3861, meaning 1 km² = 0.3861 mi² and inversely 1 mi² = 2.58999 km². That makes the Square Mile the larger of the two units in the area category, where the SI base unit is the square-meter. Every ratio here is derived from the SI/international definition rather than a rounded approximation, so results are stable across repeated conversions.
Need the reverse? Use the Square Mile to Square Kilometer converter.
Frequently Asked Questions
How do I convert Square Kilometer to Square Mile?
To convert Square Kilometer to Square Mile, you need to multiply the km² value by 0.386102.
What is the formula for km² to mi²?
The simple formula is: mi² = km² × 0.386102.
Which is bigger: Square Kilometer or Square Mile?
A Square Mile is bigger. One Square Mile is equal to approx 2.5900 Square Kilometers.
How many Square Kilometers are in one Square Mile?
There are approximately 2.58999 Square Kilometers in one Square Mile.
Quick Conversion Table
| km² | mi² |
|---|---|
| 1 | 0.3861 |
| 5 | 1.9305 |
| 10 | 3.8610 |
| 20 | 7.7220 |
| 50 | 19.3051 |
| 100 | 38.6102 |