How to Convert Miles to Kilometers
Length · Last updated: July 2025
The international mile is exactly 1,609.344 meters (1.609344 km). It survives in US and UK road distance; most of the world posts kilometers.
The formula
Kilometers = miles × 1.609344
Miles = kilometers ÷ 1.609344 (or × 0.621371)
Quick estimate: 5 miles ≈ 8 km (actual 8.05 km).
Reference table
| From | To |
|---|---|
| 1 mi | 1.609 km |
| 5 mi | 8.047 km |
| 10 mi | 16.093 km |
| 26.2 mi (marathon) | 42.195 km |
| 100 km | 62.137 mi |
| 100 mi | 160.934 km |
Practical uses
Driving abroad
Speed limits in km/h vs mph: 100 km/h ≈ 62 mph. Odometers and rental car displays may switch units—verify before estimating fuel or arrival time.
Running and cycling
Race distances are often metric (5K, 10K, marathon 42.195 km) while US training plans quote miles. Converting pace (min/mi vs min/km) requires both distance and time conversion.
Aviation and nautical miles
A nautical mile (1.852 km) is not the same as a statute mile—do not mix them on charts.
Common mistakes
- Using 1.6 exactly in precision navigation contexts.
- Confusing statute miles with nautical miles.
- Forgetting that mph → km/h uses the same mile length but applies to speed, not distance alone.
References
Convert miles and km on tounits.com — try 10 miles or 5 km.