Convert any value from kilometers to miles (or miles to kilometers) with our easy-to-use tool. See the step-by-step calculation process for precise km to mi conversion.
Convert kilometers to miles easily with our precise length conversion tool. Whether you need to calculate km to mi for road trips, fitness tracking (e.g., 5K runs), or international travel, our tool delivers instant, accurate results. Learn the kilometers to miles formula, view examples, and explore common length units.
1 kilometer (km) is equal to approximately 0.621371 miles (mi) — the international standard conversion factor for kilometers to miles calculations, defined by the 1959 International Yard and Pound Agreement.
The length L in miles (mi) is equal to the length L in kilometers (km) multiplied by 0.621371:
L(mi) = L(km) × 0.621371
Convert 10 kilometers (a common 10K race distance) to miles:
L(mi) = 10 km × 0.621371 = 6.21371 mi
For reverse conversion (miles to kilometers), use: L(km) = L(mi) × 1.60934 (since 1 mi = 1.60934 km, the exact inverse of the km to mi factor).
Explore other length units and their conversion factors, including key kilometers to miles relationships.
Large metric unit
Imperial/US unit
Base metric unit
Imperial/US unit
Imperial/US unit
Imperial/US unit
Common kilometers to miles conversions for quick reference — perfect for km to mi calculations (e.g., running, driving).
| Kilometers (km) | Miles (mi) | Calculation (km to mi) |
|---|---|---|
| 1 km | 0.621371 mi | 1 × 0.621371 = 0.621371 |
| 5 km (5K run) | 3.106855 mi | 5 × 0.621371 = 3.106855 |
| 10 km (10K run) | 6.21371 mi | 10 × 0.621371 = 6.21371 |
| 21.1 km (half-marathon) | 13.1093 mi | 21.1 × 0.621371 ≈ 13.1093 |
| 42.2 km (marathon) | 26.2186 mi | 42.2 × 0.621371 ≈ 26.2186 |
| 50 km | 31.06855 mi | 50 × 0.621371 = 31.06855 |
| 100 km | 62.1371 mi | 100 × 0.621371 = 62.1371 |
| 160.9 km (100 mi) | 100 mi | 160.9 × 0.621371 ≈ 100 |
| 1000 km | 621.371 mi | 1000 × 0.621371 = 621.371 |
Find answers to common questions about converting kilometers to miles (km to mi) and related calculations.
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