Driving in Canada or Europe, training with a metric plan, or reading a scientific paper all require turning miles into kilometers. The conversion itself is a single multiplication, but the word “mile” has meant several different lengths over the centuries — this page explains which one the converter uses and when the difference matters.
How to use the miles to km converter
- Enter a distance in Miles (mi). Decimals like 13.1 are fine.
- Read the result in kilometers, with the same distance in meters and nautical miles.
- The chart further down converts common distances from a quarter mile to 1,000 miles.
Miles to kilometers formula
The factor is exact: one international mile is 1,760 yards of 0.9144 m, which multiplies out to 1,609.344 m.
Worked example: a 10-mile training run
Step 1. 10 × 1.609344 = 16.0934 km.
Step 2. In meters that is 16,093.44 m — useful if your watch logs laps of a 400 m track (just over 40 laps).
Now try the marathon label everyone knows: 26.2 × 1.609344 = 42.1648 km. The official distance is 42.195 km, so a runner who stopped at exactly 26.2 miles would still have about 30 meters to go.
Common distances in kilometers
| Distance | Miles | Kilometers |
|---|---|---|
| The classic “mile” race | 1 | 1.609 |
| Typical 5K course | 3.1 | 4.989 |
| Half marathon label | 13.1 | 21.082 |
| Marathon label | 26.2 | 42.165 |
| A 100-mile ultra or road trip | 100 | 160.934 |
| A long day’s drive | 500 | 804.672 |
Which mile? Statute, nautical and survey
| Mile | Length in meters | Where it is used |
|---|---|---|
| International (statute) mile | 1,609.344 | Roads, running, everyday use in the US and UK |
| US survey mile | about 1,609.347 | Older US land surveys and legal descriptions |
| Nautical mile | 1,852 | Shipping, aviation, weather at sea |
The statute mile goes back to an English statute of 1593 that set the mile at eight furlongs, or 5,280 feet, to fit the furlong used in farming. The US survey mile is longer by about 3 millimeters and only matters for legacy land records. The nautical mile is based on the Earth itself — roughly one minute of latitude — and is fixed at exactly 1,852 m by international agreement. This converter uses the international statute mile.
Mental shortcuts
- Multiply by 1.6. Fast and only about 0.6% low: 50 miles → 80 km (exact 80.47).
- Multiply by 8, divide by 5. The same as 1.6, but easier with round numbers: 25 miles × 8 ÷ 5 = 40 km.
- Add 60%. 30 miles + 18 = 48 km (exact 48.28).
For speeds rather than distances, the factor is the same and the mph to km/h converter handles it directly. To go back from kilometers, use km to miles.
Frequently asked questions
How many kilometers are in a mile?
Exactly 1.609344 km. The international mile is defined as 5,280 international feet of 0.3048 m each, and 5,280 × 0.3048 m = 1,609.344 m.
Is 26.2 miles exactly a marathon?
Not quite. 26.2 miles is 42.165 km, about 30 meters short of the official 42.195 km. The exact marathon is 26.2188 miles; 26.2 is a rounded label.
What is the difference between a mile and a nautical mile?
A statute (land) mile is 1,609.344 m. A nautical mile is 1,852 m, about 15% longer, and is used at sea and in aviation. One statute mile is 0.869 nautical miles.
Is multiplying by 1.6 accurate enough?
For most purposes, yes. Using 1.6 instead of 1.609344 makes the answer about 0.6% low, so 100 miles comes out as 160 km instead of 160.93 km. For surveying, engineering or race measurement, use the exact factor.