Miles to Kilometers Converter
Enter a distance in miles to see the kilometer equivalent immediately, alongside a reference table for common distances. The two boxes are linked, so typing kilometers converts back to miles. The land mile is defined as exactly 1.609344 kilometers, and every conversion runs locally in your browser.
How to convert miles to kilometers
- Type a distance into the Miles (mi) box on the left.
- Read the result in the Kilometers (km) box, which updates as you type.
- Type into the Kilometers (km) box to convert kilometers back to miles.
- Use the reference table for common mile to kilometer values.
Examples
One mile
1 mi
1.609344 km
Ten miles
10 mi
16.09344 km
Marathon distance
26.2 mi
42.164813 km
Frequently asked questions
What is the formula to convert miles to kilometers?
Multiply the number of miles by 1.609344. So km equals miles times 1.609344, and 10 miles becomes 16.09344 km. The factor is exact rather than rounded.
How many kilometers is a marathon?
A marathon is 26.2 miles, which multiplies out to about 42.164813 km. The official course length is set at 42.195 km, a touch longer because the race is defined in metric rather than rounded from 26.2 miles.
What are some common miles to kilometers conversions?
1 mile is 1.609344 km, 5 miles is about 8.04672 km, 10 miles is 16.09344 km, 50 miles is about 80.4672 km, and 100 miles is 160.9344 km. The table under the tool lists these.
How do I convert kilometers back to miles?
Type your value into the Kilometers (km) box on the right and the Miles (mi) box updates on its own. That divides by 1.609344, so 10 km is about 6.213712 miles.
Does the same factor work for miles per hour to km/h?
Yes, the numeric factor is identical, so 60 mph is about 96.56 km/h and 65 mph is about 104.61 km/h. This tool converts distance rather than speed, so for a labelled speed result a dedicated speed converter is clearer.
Is a nautical mile the same as a mile here?
No. This tool uses the statute or land mile of 1.609344 km, the one on road signs. A nautical mile, used in aviation and at sea, is longer at exactly 1.852 km, so do not use this converter for marine or air distances.
Why is the factor 1.609344 and not a rounder number?
A mile is 5280 feet and a foot is exactly 0.3048 meters, so a mile is 5280 times 0.3048, which is 1609.344 meters, or 1.609344 km. The odd-looking number is just those two exact definitions multiplied together.
Is this conversion exact?
Yes. The international mile is defined as exactly 1.609344 kilometers, so the formula is exact. Results are rounded to six decimal places for display, but the calculation itself is precise.
Is my data sent anywhere?
No. The conversion runs entirely in your browser, so the distances you enter never leave your device and nothing is uploaded.
Learn more
- Miles vs kilometers: the road distance divide
Why some countries measure roads in miles and others in kilometers, where the exact 1.609344 factor comes from, and how to convert on the fly.
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