Miles to Kilometers Converter
1 mile = 1.609 km (exactly 1.609344 km). Road signs in the US, UK, Myanmar, and Liberia use miles; the rest of the world uses kilometers. A marathon is 26.2 miles = 42.195 km. Multiply miles by 1.609344 to convert; divide km by 1.609344 to reverse.
Last updated: June 2026
Enter a value to see the conversion instantly.
How to convert miles to kilometers
Enter a value in the miles field to instantly see the equivalent in kilometers. The formula is: km = miles × 1.609344.
Distance reference: races, roads, and weekly mileage
| Miles | Kilometers | Context |
|---|---|---|
| 1 mi | 1.609 km | Short drive |
| 3.1 mi | 5 km | 5K race |
| 6.2 mi | 10 km | 10K race |
| 13.1 mi | 21.1 km | Half marathon |
| 26.2 mi | 42.2 km | Full marathon |
| 60 mi | 96.6 km | Hour's drive at 60 mph |
| 100 mi | 160.9 km | Road trip leg |
When is this useful?
Miles are the standard distance unit in the United States, while most of the world uses kilometers. This gap shows up constantly: a US road sign says 30 miles to the next city, but your international navigation app expects kilometers. Runners training for a European race need to compare splits in km. Car buyers importing a vehicle from the US see an odometer in miles and need to estimate service intervals in km. GPS watches often default to miles for US users but display pace in km on international race courses. Whether you're planning a cross-country road trip, tracking weekly mileage in a metric fitness app, or converting a speed limit before driving abroad, this converter handles the calculation instantly with no rounding guesswork.
Converting your running pace and weekly mileage
If you train in miles but race or compare splits in kilometers, two numbers matter: total distance and pace. Distance is the easy part, since you multiply miles by 1.609344. Pace is the one runners get wrong, because a faster per-mile time turns into a smaller per-kilometer number. To turn a min/mile pace into min/km, divide by 1.609344 (or multiply by 0.621371). An 8:00 per mile pace is 8 ÷ 1.609344 = 4.97 minutes per km, which is about 4:58 per km. A 10:00 mile is roughly 6:13 per km.
For weekly volume the same factor applies to the whole total. A 30 mile training week is 30 × 1.609344 = 48.3 km, and a 40 mile week is about 64.4 km. The short table below pairs common per-mile paces with their per-kilometer equivalents.
| Pace per mile | Pace per km |
|---|---|
| 7:00 / mile | 4:21 / km |
| 8:00 / mile | 4:58 / km |
| 9:00 / mile | 5:36 / km |
| 10:00 / mile | 6:13 / km |
| 11:00 / mile | 6:50 / km |
Frequently Asked Questions
How many km is 1 mile?
Exactly 1.609344 km. This is a defined conversion, not an approximation: the international yard and pound agreement of 1959 fixed 1 inch at 2.54 cm, which means 1 mile (5280 feet) is precisely 1,609.344 meters, or 1.609344 km.
Why is a mile longer than a kilometer?
The mile comes from the Roman "mille passuum" (one thousand paces), later standardized in England as 8 furlongs or 5,280 feet. The kilometer was defined by the metric system in the late 18th century as one thousandth of a meridian degree. The two systems developed independently, which is why 1 mile ends up being roughly 1.6 times the length of 1 kilometer.
How do I quickly estimate miles to km in my head?
Multiply by 1.6 for a fast mental estimate. For example, 10 miles is roughly 16 km, and 50 miles is roughly 80 km. For a slightly more accurate shortcut, multiply by 8 and divide by 5. The true factor is 1.609344, so the 1.6 approximation is off by less than 0.6%.
My GPS shows miles. How do I switch it to kilometers?
On most dedicated GPS devices and smartphones, go to Settings and look for Units or Measurement System. On Garmin devices, it is under System > Units > Distance. On Google Maps, tap your profile icon, then Settings > Distance units, and choose Kilometers. On Apple Maps, go to iOS Settings > Maps > Distances and select Metric. Most fitness watches have the same option under Activity or Sensor settings.
How many miles per hour is 100 km/h?
100 km/h equals approximately 62.14 mph. This is a common reference point because 100 km/h is the standard motorway speed limit in many countries, while the closest round number in the US is 60 mph (96.6 km/h).
What is an 8 minute mile in minutes per kilometer?
An 8:00 per mile pace is about 4:58 per kilometer. To convert any min/mile pace to min/km, divide the per-mile time by 1.609344. For example, a 9:00 mile is roughly 5:36 per km and a 10:00 mile is about 6:13 per km. The per-km number is always smaller because a kilometer is shorter than a mile.
How do I convert my weekly running mileage to kilometers?
Multiply your weekly mileage by 1.609344. A 30 mile week is about 48.3 km and a 40 mile week is about 64.4 km. The same factor works for a single long run: a 12 mile run is 19.3 km. This is handy when a training plan is written in km but your watch records in miles.