Miles to KM Converter
Convert miles to kilometres — one mile is exactly 1.609344 km. Results update as you type; exact factors shown.
One mile is 1.6093 kilometres — see the exact factor, not a rounded rule of thumb.
How the miles to km converter works
Every length is converted through the metre, the SI base unit of length. The inch has been defined as exactly 25.4 mm since the 1959 international yard and pound agreement, so a foot is exactly 0.3048 m, a yard 0.9144 m and a statute mile 1,609.344 m. The nautical mile is 1,852 m by international definition.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common length conversions
| From | To | Units |
|---|---|---|
| 1 mi | 1.6093 km | mile to kilometres |
| 2 mi | 3.2187 km | miles to kilometres |
| 3 mi | 4.828 km | miles to kilometres |
| 5 mi | 8.0467 km | miles to kilometres |
| 10 mi | 16.0934 km | miles to kilometres |
| 13.1 mi | 21.0824 km | miles to kilometres |
| 20 mi | 32.1869 km | miles to kilometres |
| 26.2 mi | 42.1648 km | miles to kilometres |
| 50 mi | 80.4672 km | miles to kilometres |
| 60 mi | 96.5606 km | miles to kilometres |
| 100 mi | 160.9344 km | miles to kilometres |
| 500 mi | 804.672 km | miles to kilometres |
Units in this converter and their exact factors
| Unit | Symbol | One unit in metres |
|---|---|---|
| millimetre | mm | 0.001 metre |
| centimetre | cm | 0.01 metre |
| metre | m | 1 metre |
| kilometre | km | 1,000 metre |
| inch | in | 0.0254 metre |
| foot | ft | 0.3048 metre |
| yard | yd | 0.9144 metre |
| mile | mi | 1,609.344 metre |
| nautical mile | nmi | 1,852 metre |
FAQFrequently asked questions about length conversion
How many km is 1 mile?
Exactly 1.609344 km.
How far is a half marathon in km?
13.109 miles is 21.1 km.
What is 60 mph in km/h?
96.6 km/h — which is why 100 km/h and 60 mph feel similar.
How do I estimate miles to km?
Add half again and a bit: 20 miles is about 32 km.
Which countries still use miles?
The United States and the United Kingdom for road signs, plus a handful of others; almost everywhere else posts kilometres.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.