How to Convert Miles to Kilometres (mi to km)
Length conversions come up when reading overseas furniture specs, cycling the Round Island Route in kilometres while a foreign app shows miles, or checking marine distances in the Singapore Strait in nautical miles. This guide shows how to convert miles into kilometres by hand, with examples and a quick-reference table.
The conversion
To convert miles to kilometres, multiply the value by 1.609344. To go the other way, divide by the same number (or multiply by 0.6213711922). For a quick estimate, multiply by about 1.6.
Kilometres = miles × 1.609344
Worked examples
- 3 mi = 4.828 km
- 12.5 mi = 20.1168 km
- 75 mi = 120.7008 km
Miles to Kilometres table
| Miles | Kilometres |
|---|---|
| 1 mi | 1.6093 km |
| 2 mi | 3.2187 km |
| 5 mi | 8.0467 km |
| 10 mi | 16.0934 km |
| 20 mi | 32.1869 km |
| 25 mi | 40.2336 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.9344 km |
| 250 mi | 402.336 km |
| 500 mi | 804.672 km |
| 1,000 mi | 1,609.34 km |
Common questions
Is mi to km exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Kilometres to Miles converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Miles to Kilometres Converter or browse all length converters.
Run your own numbers: Miles to Kilometres Converter