Miles to KM Converter
Convert miles to kilometers in one step. Enter a distance in miles and get the exact value in km, with the formula, examples and common distances below.
Kilometers = Miles × 1.609344
Miles to KM Formula
To convert miles to kilometers, multiply the number of miles by 1.609344. This is the exact definition of the international mile, so no approximation is involved. To convert kilometers to miles, divide by 1.609344, or multiply by about 0.6213711922.
Miles and Kilometers Explained
The mile (mi) used today is the international mile, defined as exactly 1,609.344 meters or 5,280 feet. It is the road-distance unit in the United States and the United Kingdom, where speed limits and road signs use miles per hour. A separate nautical mile (1,852 m) is used at sea and in the air and is not the same thing.
The kilometer (km) is 1,000 meters and is the standard road and travel distance unit in nearly every other country. Distances, speed limits and running events are measured in kilometers across the metric world.
How to Convert Miles to Kilometers
- Enter the distance in miles. Decimals such as 13.1 work, and negative values are accepted for signed distances such as route offsets.
- The answer in kilometers appears instantly, or press Convert Now.
- Use Swap Units to convert kilometers to miles, Copy Result to copy the answer, or Clear to start again.
Step-by-step by hand
- Write down the distance in miles, for example 50 miles.
- Multiply by 1.609344: 50 × 1.609344 = 80.4672.
- Add the unit: 50 miles = 80.4672 km.
For a mental estimate, multiply miles by 1.6, or add half and then a tenth of the miles (1 + 0.5 + 0.1 = 1.6). For 30 miles that gives 30 + 15 + 3 = 48 km, against the exact 48.28032 km. The same factor converts speed, so miles per hour become kilometers per hour.
Practical Examples
- Road trip: 250 miles × 1.609344 = 402.336 km.
- Marathon: 26.2 miles is about 42.164813 km (the official distance is 42.195 km, or 26.21875 miles).
- Half marathon: 13.1 miles is about 21.082406 km.
- Speed limit: 65 mph is 104.60736 km/h, and 30 mph is 48.28032 km/h.
- Daily run: a 3-mile run is 4.828032 km.
- Negative value: −5 miles = -8.04672 km, for example five miles behind a starting point.
Miles to KM – Common Values
Quick reference for frequently used conversions
| Miles (mi) | Kilometers (km) | Meters (m) |
|---|---|---|
| 0.25 mi | 0.402336 km | 402.336 m |
| 0.5 mi | 0.804672 km | 804.672 m |
| 1 mi | 1.609344 km | 1,609.344 m |
| 2 mi | 3.218688 km | 3,218.688 m |
| 3 mi | 4.828032 km | 4,828.032 m |
| 5 mi | 8.04672 km | 8,046.72 m |
| 10 mi | 16.09344 km | 16,093.44 m |
| 13.1 mi | 21.082406 km | 21,082.4064 m |
| 15 mi | 24.14016 km | 24,140.16 m |
| 20 mi | 32.18688 km | 32,186.88 m |
| 26.2 mi | 42.164813 km | 42,164.8128 m |
| 30 mi | 48.28032 km | 48,280.32 m |
| 50 mi | 80.4672 km | 80,467.2 m |
| 60 mi | 96.56064 km | 96,560.64 m |
| 75 mi | 120.7008 km | 120,700.8 m |
| 100 mi | 160.9344 km | 160,934.4 m |
| 150 mi | 241.4016 km | 241,401.6 m |
| 200 mi | 321.8688 km | 321,868.8 m |
| 250 mi | 402.336 km | 402,336 m |
| 500 mi | 804.672 km | 804,672 m |
| 1000 mi | 1,609.344 km | 1,609,344 m |
Where and Why This Conversion Is Used
Because the US and UK road systems use miles while most other countries use kilometers, this is one of the most frequently needed distance conversions.
- Driving and travel: road signs, rental-car mileage and speed limits are posted in miles in the US and UK and in kilometers elsewhere.
- Running and cycling: training plans and race distances such as 5 miles, 10 miles or a marathon are compared with 5K and 10K events.
- Logistics: delivery ranges, freight distances and fuel planning need a consistent unit across borders.
- Real estate and commuting: distances to schools, stations and city centers are listed in miles or kilometers depending on the market.
- Fitness trackers and maps: apps can display either unit, and recorded workouts are sometimes shared in miles.
To go the other way use the KM to Miles Converter, or convert speeds with the MPH to KPH Converter.