KM to Miles Converter
Convert kilometres to miles instantly. One kilometre is 0.621371 miles, the exact reciprocal of the mile’s definition as 1.609344 kilometres.
Type a distance below and the result updates as you type. The formula, a distance chart and answers to the most common questions follow.
KM to Miles converter
kilometres (km)= miles (mi)The formula
kilometres × 0.621371 = miles. To reverse it, multiply miles by 1.609344 to get kilometres.
This is the conversion British drivers need on the way home: a sign reading 120 km to the ferry port is 74.6 miles, and a European motorway limit of 130 km/h is just under 81 mph.
A neat mental trick uses the Fibonacci sequence, where each number is roughly 1.6 times the one before it. Five kilometres is about 3 miles, 8 km about 5 miles, 13 km about 8 miles and 21 km about 13 miles. For anything else, multiply by six and drop a decimal place: 40 km becomes 240, then 24 miles, against a true figure of 24.85.
Kilometres to miles chart
| Kilometres | Miles | Typical context |
|---|---|---|
| 1 km | 0.62 mi | Short walk |
| 5 km | 3.11 mi | parkrun distance |
| 10 km | 6.21 mi | 10 km race |
| 21.1 km | 13.11 mi | Half marathon |
| 42.195 km | 26.22 mi | Marathon |
| 50 km | 31.07 mi | Short drive |
| 100 km | 62.14 mi | Motorway leg |
| 130 km | 80.78 mi | European limit per hour |
| 500 km | 310.69 mi | Long journey |
Frequently asked questions
How many miles is 1 km?
One kilometre is 0.621371 miles, usually rounded to 0.62 miles.
How many miles is 10 km?
Ten kilometres is 6.21 miles, which is why a 10 km race is often called a six-miler.
How do I convert km/h to mph?
Multiply the kilometres per hour by 0.621371. A limit of 100 km/h is about 62 mph.
Why does the UK still use miles?
Road signs, speed limits and distance markers were exempted when Britain adopted metric units for trade, so miles remain the legal unit on the road network.
What is the fastest mental estimate?
Multiply by six and move the decimal point one place left. It is about one per cent low, which is close enough for navigation.
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