KM to Miles Converter
Convert kilometres to miles — one kilometre is 0.6214 miles, so a 5 km run is just over three miles. Results update as you type; exact factors shown.
One kilometre is 0.6214 miles — see the exact factor, not a rounded rule of thumb.
How the km to miles 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.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common length conversions
| From | To | Units |
|---|---|---|
| 1 km | 0.6214 mi | kilometre to miles |
| 2 km | 1.2427 mi | kilometres to miles |
| 5 km | 3.1069 mi | kilometres to miles |
| 10 km | 6.2137 mi | kilometres to miles |
| 15 km | 9.3206 mi | kilometres to miles |
| 21.1 km | 13.1109 mi | kilometres to miles |
| 25 km | 15.5343 mi | kilometres to miles |
| 42.2 km | 26.2219 mi | kilometres to miles |
| 50 km | 31.0686 mi | kilometres to miles |
| 100 km | 62.1371 mi | kilometres to miles |
| 500 km | 310.6856 mi | kilometres to miles |
| 1,000 km | 621.3712 mi | kilometres to miles |
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 miles is 1 km?
0.6214 miles, near enough to five-eighths.
How far is a 5K in miles?
3.107 miles.
How long is a marathon in miles?
42.195 km is 26.219 miles — the famous 26 miles 385 yards.
What is the quick trick for km to miles?
Multiply by 6 and drop a digit: 80 km → 480 → 48 miles, and the exact answer is 49.7. Fibonacci numbers work too — 8 km is about 5 miles, 13 km about 8.
Is a speed limit of 100 km/h fast?
It is 62 mph, a typical open-road limit.
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 Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.