Unit converter
Kilometers to Miles Converter
Kilometres to miles conversion helps with route planning, race distances, vehicle range, hiking guides, and map scales that cross metric and imperial sources.
1 kilometer = 0.621371 miles
Common kilometers to miles values
| Kilometers | Miles |
|---|---|
| 1 km | 0.621371 mi |
| 2 km | 1.2427 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 20 km | 12.4274 mi |
| 50 km | 31.0686 mi |
| 100 km | 62.1371 mi |
In units.ts, a kilometre is 1000 metres and a mile is 1609.344 metres, so the exact factor is 1000 / 1609.344. Use this page when a European road distance, cycling route, or 10K training plan needs a mile figure for pacing, fuel stops, travel notes, or comparison with US reviews.
How to convert
- Take the distance in kilometres as the starting value.
- Use the exact ratio 1000 / 1609.344 from kilometre.toBase divided by mile.toBase.
- Multiply kilometres by 1000 / 1609.344 to get miles.
- The decimal form is about 0.621371192237334, but the ratio is the source value.
- Mental trick: use 0.62 miles per kilometre, then add a small amount for long distances.
miles = kilometres * (1000 / 1609.344)
The converter compares both units through metres. A kilometre contributes 1000 metres and a mile contributes 1609.344 metres, so the fixed multiplier is 1000 / 1609.344 miles per kilometre.
- km
- distance entered in kilometres
- 1000 / 1609.344
- exact miles per kilometre
Worked example
A 21.0975 km half marathon is 21.0975 * (1000 / 1609.344), which is about 13.1094 miles. Keeping four decimals is useful for race references before rounding for display.
Key facts
- 1 km is about 0.621371192237334 mi.
- 5 km is about 3.106855961 mi.
- 10 km is about 6.213711922 mi.
- 100 km is about 62.137119224 mi.
Tips
- Use 0.62 for quick travel estimates, then calculate exactly for pacing or range.
- Convert the total distance before dividing into splits.
- For road signs and map notes, one decimal place is usually enough.
Frequently asked questions
How many miles are in 1 kilometre?+
One kilometre is exactly 1000 / 1609.344 miles, about 0.621371192237334 miles.
Is a 5K race exactly 3.1 miles?+
No. 5 km is about 3.106855961 miles, so 3.1 miles is a rounded race-friendly label.
Why does the formula use 1609.344?+
The international mile is defined as exactly 1609.344 metres, and the kilometre is exactly 1000 metres.
How many kilometres are in 1 mile?+
There are exactly 1.609344 kilometres in 1 mile.
Things to watch
- This page uses statute miles, not nautical miles.
- Rounding every kilometre separately can add drift over a long route.
Sources
Last updated: 2026-01-01
Conversions use internationally defined factors. Provided for general use; verify critical measurements independently.