Unit Converter
Kilometers to Miles Converter
Convert kilometers to miles instantly. 1 km = 0.621371 mi. Free, live converter with full tables.
Miles
0.621371 mi
1 km = 0.621371 mi
Kilometers to Miles formula
mi = km × 0.621371The kilometer-to-mile conversion derives from the international agreement that 1 km equals exactly 0.621371 miles. This ratio stems from the meter's definition as a standard unit of length in the metric system, while the mile remains a traditional imperial/US customary unit. One simple multiplication gives you the precise conversion.
Kilometers to Miles conversion table
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 km | 0.621371 mi |
| 2 km | 1.2427 mi |
| 3 km | 1.8641 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 20 km | 12.4274 mi |
| 25 km | 15.5343 mi |
| 50 km | 31.0686 mi |
| 100 km | 62.1371 mi |
| 500 km | 310.69 mi |
| 1000 km | 621.37 mi |
When you need to convert kilometers to miles
- Running and fitness: converting race distances (5K, 10K, half-marathon pace planning)
- Road trips: checking distance estimates between cities when traveling internationally
- Cycling: measuring route lengths and speed targets on metric vs. imperial dashboards
- Travel planning: estimating walk distances and hotel proximity in foreign countries
- Aviation and shipping: quick reference for fuel efficiency and distance calculations
Frequently asked questions
Why is 1 km equal to 0.621371 miles?
The conversion ratio comes from the exact definitions of both units: 1 kilometer = 1,000 meters (SI standard), and 1 mile = 1.609344 kilometers by international agreement. Dividing gives 0.621371 miles per kilometer.
Is this converter accurate for navigation apps and fitness trackers?
Yes. The formula mi = km × 0.621371 is the standard conversion used globally by GPS devices, running apps, and mapping tools. It's precise enough for all practical purposes.
Do I need to round the result when converting?
For everyday use, rounding to 2–3 decimal places is fine. For engineering or scientific work, use the full precision. The converter displays results at your chosen accuracy.