The kilometer (km) is the standard road-distance unit in most of the world, while the mile (mi) remains the everyday unit in the United States and the United Kingdom. Kilometers-to-miles conversion is a routine need for runners entering 5K and 10K races, drivers renting cars abroad, and anyone reading metric road signs or GPS distances with a miles-based mindset.
One kilometer equals about 0.621371 miles, so a 10 km run is 6.21 miles and a 100 km/h speed limit corresponds to 62 mph. For mental math, multiply kilometers by 5/8: 80 km × 5 ÷ 8 gives 50 miles, within 0.6 percent of the true 49.7 miles.
Table Of Contents
Kilometers to miles Conversion
1 kilometers (km) is equal to 0.6213711922 miles (mi).
1 km = 0.6213711922 mi
or
1 mi = 1.609344 km
Formula
To convert a length from kilometers (km) to miles (mi), divide the length in kilometers by 1.609344
l(mi) = l(km) / 1.609344
Examples:
Convert 42 kilometers to miles:
l(mi) = 42km / 1.609344 = 26.09759007 mi
Conversion table
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 km | 0.621371192 mi |
| 2 km | 1.242742384 mi |
| 3 km | 1.864113577 mi |
| 5 km | 3.106855961 mi |
| 10 km | 6.213711922 mi |
| 15 km | 9.320567884 mi |
| 20 km | 12.427423845 mi |
| 21 km | 13.048795037 mi |
| 25 km | 15.534279806 mi |
| 42 km | 26.097590074 mi |
| 50 km | 31.068559612 mi |
| 100 km | 62.137119224 mi |
| 250 km | 155.342798059 mi |
| 500 km | 310.685596119 mi |
| 1000 km | 621.371192237 mi |
| Miles (mi) | Kilometers (km) |
|---|---|
| 1 mi | 1.609344 km |
| 2 mi | 3.218688 km |
| 3 mi | 4.828032 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.09344 km |
| 15 mi | 24.14016 km |
| 20 mi | 32.18688 km |
| 21 mi | 33.796224 km |
| 25 mi | 40.2336 km |
| 42 mi | 67.592448 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.9344 km |
| 250 mi | 402.336 km |
| 500 mi | 804.672 km |
| 1000 mi | 1609.344 km |
Frequently asked questions
How do I convert kilometers to miles?
Divide the value in kilometers by 1.609344 to get the result in miles. For example, 5 km ÷ 1.609344 = 3.106855961 mi.
How many miles are in 1 kilometers?
1 kilometers (km) is equal to 0.621371192 miles (mi).
How do I convert miles back to kilometers?
Use the inverse operation: multiply the value in miles by 1.609344 to get the result in kilometers.
How accurate is the kilometers to miles conversion?
The converter multiplies by the conversion factor 1.609344 and rounds the result to 9 decimal places by default. You can increase or reduce the precision with the digits option on this page.
How many miles is a 5K run?
A 5K race covers 3.11 miles (5 × 0.621371). A 10K is 6.21 miles, a half marathon of 21.0975 km equals 13.11 miles, and a full marathon of 42.195 km is 26.22 miles. Race distances are certified in kilometers, so the mile figures are always rounded equivalents.
What is 120 km/h in miles per hour?
120 km/h equals about 74.6 mph, so a 120 limit on a European motorway is close to the 75 mph limits found on some US interstates. Conversions worth memorizing when driving: 50 km/h is about 31 mph, 90 km/h about 56 mph, and 130 km/h about 81 mph.
