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. 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.
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 |
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.