In 1 miles there are 1.609344 kilometers. Meanwhile in 1 kilometers there are 0.621371 miles. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Kilometers to Miles calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert miles to kilometers, use this rule:
Example:
For a quick estimate, use 1.6 instead of 1.60934:
To convert kilometers to miles, reverse the math:
To convert miles to kilometers, multiply miles by 1.609344.
Formula: kilometers = miles × 1.609344.
1 mile = 1.609344 kilometers.
People often round it to 1.61 km for quick estimates.
1 kilometer = 0.621371 miles.
A quick mental rule is that 1 km is a bit over half a mile.
A mile and a kilometer come from different measurement systems.
A mile is part of the imperial and US customary systems.
A kilometer is part of the metric system, based on powers of 10.
Use a simple rule: multiply miles by 1.6.
It’s close enough for most day-to-day needs. For exact results, use 1.609344.
It’s a good estimate, but it’s not exact.
The difference is 0.009344 km per mile (about 9 meters). Over long trips, small gaps add up.
5 miles = 8.04672 kilometers.
Rounded: about 8.05 km.
10 miles = 16.09344 kilometers.
Rounded: about 16.09 km (or 16.1 km).
0.5 mile = 0.804672 kilometers.
That’s about 0.80 km.
A marathon is 42.195 kilometers.
That equals 26.2188 miles (often shown as 26.2 miles).
Multiply mph by 1.609344.
Formula: km/h = mph × 1.609344.
Example: 60 mph = 96.56064 km/h (about 96.6 km/h).
A mile usually means the international mile, which is 1.609344 km.
Some older or special miles exist in history, but they’re not used for modern road distance.
Round when you only need a quick estimate, like travel planning or casual runs.
Use more decimals when precision matters, like mapping, race distance, and data logs.
The Calculate Box tool to convert miles to kilometers uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a miles value in the box and have it instantly converted to kilometers.