Convert Miles to Kilometers
Convert miles (mi) to kilometers (km) instantly, with the 1 mi = 1.609 km formula plus real examples from running and US road trips.
- Millimeter (mm)1,609,344
- Centimeter (cm)160,934.4
- Meter (m)1,609.344
- Kilometer (km)1.609344
- Inch (in)63,360
- Foot (ft)5,280
- Yard (yd)1,760
- Mile (mi)1
- Ja/Chuk (자)5,311.366
- Chi/Chon (치)53,113.66
🔒 Unit conversions are computed in your browser.
The mile-to-kilometer formula
One mile equals 1.609 kilometers, so you multiply the mile figure by 1.609 to get kilometers (km = mi × 1.609). For example, 3 miles is 3 × 1.609 = 4.83 km, and 10 miles is 16.09 km. To go the other way, divide kilometers by 1.609. For quick mental math, remember 'multiply miles by 1.6' — but that shortcut drifts further from the true value as distances grow, so lean on the converter above whenever the exact number matters.
Where running and driving need it
In running, a 5K (5 km) is about 3.11 miles, a half marathon of 13.1 miles is 21.08 km, and a full 26.2-mile marathon is 42.16 km. US treadmills often display miles, so converting your pace to km is common. Driving is the same story: road signs in the US and UK use miles, so a 60 mph limit is roughly 96.6 km/h and 70 mph is about 112.7 km/h. If your rental car reads in mph, knowing a 100-mile leg is 160.9 km helps you plan fuel and time.
Easy things to get wrong
First, a statute (land) mile is 1.609 km, but a nautical mile is 1.852 km — aviation and sailing use the nautical mile, so the same word 'mile' can mean different distances. Second, 1.609 is rounded; the fuller value is 1.60934 km. That gap is invisible over short trips, but 500 miles is 804.5 km at 1.609 versus 804.67 km precisely — about 0.17 km apart. Third, speed (mph to km/h) uses the exact same 1.609 factor, so there is no separate rule to memorize.
Frequently asked questions
How many kilometers is 1 mile?
One mile is 1.609 kilometers. The more precise value is 1.60934 km, but 1.609 is plenty for everyday use. So 5 miles is about 8.05 km and 100 miles is about 160.9 km.
How many kilometers is a 26.2-mile marathon?
26.2 miles × 1.609 = about 42.16 km. The official marathon distance is defined as 42.195 km (roughly 26.219 miles), so rounding creates a tiny difference in the decimals.
Does converting mph to km/h use the same method?
Yes. Speed converts exactly like distance — multiply by 1.609. So 60 mph is about 96.6 km/h and 70 mph is about 112.7 km/h, which is handy for reading US and UK speed limits in km/h.