Miles to Kilometers Converter
Type 1 mi and read 1.609344 km. Use ↔ when you need the reverse direction.
Miles input
miType a number and the result updates immediately.
Kilometers
kmBasis: 1 mi = 1.609344 km
Basis: 1 mi = 1.609344 km
ready to use.
- Visible firstKeep the input and result positions clear.
- Results firstPut the main number up front and keep the process secondary.
- Less to askNo sign-up or extra information before using the tool.
Convert miles and kilometers in one clean row
This converter works like a simple input-and-output window: type one number in the source window, then read the opposite unit in the result window. It opens with 1 mi → 1.609344 km so the standard value is visible immediately.
The basis is the international mile: 1 mi = 1.609344 km. Use it for ordinary road, travel, and running distances, not for nautical miles or legacy survey-mile contexts.
Use the screen in order
Start with the number you have in the source window and read the result window. The center ↔ button, or the lower swap button, reverses the direction and carries the current result into the input.
- Enter miles to read kilometers in the result window.
- Swap direction to enter kilometers and read miles.
- Copy result copies the currently visible input and output as one line.
How to read the result
For miles to kilometers, multiply by 1.609344. For kilometers to miles, divide by 1.609344.
The page shows up to six decimals and trims unnecessary trailing zeros. For conversation, 1 mile is roughly 1.6 km; for records or published copy, keep the unit label with the number.
Worked examples
These examples match what the live converter shows. Read the input direction and the output unit together before copying the number elsewhere.
Rounding and unit caution
Race notes and travel planning can often round to one or two decimals. Specifications, tables, and official material should keep enough precision for the context.
- Everyday reading: 1 mi ≈ 1.6 km is usually enough.
- Records and tables: copy the number together with mi or km.
- Nautical or survey use: check that document’s own unit definition.
Source
NIST Handbook 44 Appendix C lists official relationships between U.S. customary units and SI units.
FAQ
Why does the page start with 1 mi?
It shows the standard relationship immediately: 1 mi equals 1.609344 km. Typing another number updates the result right away.
How do I convert km to mi?
Use the center ↔ button or the lower swap button. The input unit changes to km and the right-side result changes to mi.
How many kilometers are in one mile?
One international mile is exactly 1.609344 kilometers. The converter uses that fixed relationship.
How many kilometers is 5 miles?
5 miles is 8.04672 kilometers. The calculation multiplies 5 by 1.609344.
Can I use this for nautical or survey miles?
No. Nautical miles and old U.S. survey-mile contexts use different definitions. This page is for ordinary international miles used in roads, travel, and running references.