Convert Kilometers to Miles
Kilometers to miles is the everyday conversion for anyone reading a metric distance in a country that still thinks in miles. One kilometer is about 0.621371 miles, so the number always gets smaller when you switch from km to miles.
Kilometers to Miles conversion table
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 | 0.621371 |
| 2 | 1.242742 |
| 3 | 1.864114 |
| 5 | 3.106856 |
| 10 | 6.213712 |
| 20 | 12.427424 |
| 50 | 31.06856 |
| 100 | 62.137119 |
| 500 | 310.685596 |
| 1,000 | 621.371192 |
The formula
To convert kilometers to miles, multiply the distance in kilometers by 0.621371 (or divide by 1.609344):
miles = kilometers × 0.621371
A worked example
Convert a 42.195 km marathon back into miles:
42.195 × 0.621371 = 26.22 miles
Which is the familiar 26.2-mile marathon distance — the same race, measured in the other system.
The 5-to-8 shortcut
Kilometers and miles line up neatly at 8 and 5: 8 km is almost exactly 5 miles. That gives you a quick ladder — 16 km ≈ 10 miles, 40 km ≈ 25 miles — that's close enough for planning a drive or a run, though not for precise work.
When you'll use it
Converting European road distances and speed limits, reading fitness trackers set to metric, comparing car specs, and making sense of weather or travel information quoted in kilometers.
Frequently asked questions
How many miles are in a kilometer?
About 0.621371 miles. It is the exact reciprocal of the mile-to-kilometer factor (1 ÷ 1.609344), so the two conversions are perfectly consistent.
What's a fast mental estimate for kilometers to miles?
Take about five-eighths of the number, or subtract roughly 38%. So 100 km is about 62 miles, and 8 km is about 5 miles — a handy pairing to remember.
Why do speed limits look so different in km/h and mph?
Because a kilometer is shorter than a mile, the same speed carries a bigger number in km/h. 100 km/h is only about 62 mph, which is why metric speed limits look higher at a glance.