KM to Miles Converter
Convert kilometers to miles — one kilometer is 0.6214 miles, so a 5 km run is just over three miles. Results update as you type; exact factors shown.
One kilometer 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 meter, 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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common length conversions
| From | To | Units |
|---|---|---|
| 1 km | 0.6214 mi | kilometer to miles |
| 2 km | 1.2427 mi | kilometers to miles |
| 5 km | 3.1069 mi | kilometers to miles |
| 10 km | 6.2137 mi | kilometers to miles |
| 15 km | 9.3206 mi | kilometers to miles |
| 21.1 km | 13.1109 mi | kilometers to miles |
| 25 km | 15.5343 mi | kilometers to miles |
| 42.2 km | 26.2219 mi | kilometers to miles |
| 50 km | 31.0686 mi | kilometers to miles |
| 100 km | 62.1371 mi | kilometers to miles |
| 500 km | 310.6856 mi | kilometers to miles |
| 1,000 km | 621.3712 mi | kilometers to miles |
Units in this converter and their exact factors
| Unit | Symbol | One unit in meters |
|---|---|---|
| millimeter | mm | 0.001 meter |
| centimeter | cm | 0.01 meter |
| meter | m | 1 meter |
| kilometer | km | 1,000 meter |
| inch | in | 0.0254 meter |
| foot | ft | 0.3048 meter |
| yard | yd | 0.9144 meter |
| mile | mi | 1,609.344 meter |
| nautical mile | nmi | 1,852 meter |
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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.