How to convert km to miles
Example: a 10 km run is 10 × 0.6214 = 6.21 miles. Mental math: take 60% and nudge up — 100 km → 60 + 2 = 62 miles. Or run the Fibonacci trick backward: 21 km ≈ 13 miles, 8 km ≈ 5 miles.
Km to miles conversion chart
| km | miles |
|---|---|
| 1 | 0.6 |
| 2 | 1.2 |
| 3 | 1.9 |
| 5 | 3.1 |
| 10 | 6.2 |
| 15 | 9.3 |
| 20 | 12.4 |
| 21.1 | 13.1 |
| 25 | 15.5 |
| 30 | 18.6 |
| 40 | 24.9 |
| 42.2 | 26.2 |
| 50 | 31.1 |
| 60 | 37.3 |
| 80 | 49.7 |
| 100 | 62.1 |
| 150 | 93.2 |
| 200 | 124.3 |
| 300 | 186.4 |
| 500 | 310.7 |
| 1000 | 621.4 |
Speeds: km/h → mph
| km/h | mph | Context |
|---|---|---|
| 30 | 18.6 | European urban zones |
| 50 | 31.1 | City default in most of the world |
| 80 | 49.7 | Rural roads |
| 100 | 62.1 | Highways (many countries) |
| 120 | 74.6 | Motorways (EU typical) |
| 130 | 80.8 | French autoroutes / Italian autostrade |
Distances in perspective
The 21.1 km half marathon is 13.1 miles; a 100 km ultramarathon is 62 miles. Driving: Paris–Lyon's ~465 km is 289 miles; the "500-mile" Indy race is 805 km. For fuel economy, note the units flip meaning: higher mpg is better, but lower L/100 km is better — 30 mpg (US) equals 7.8 L/100 km.
Frequently asked questions
How many miles is 1 km?
0.6214 miles — about five-eighths of a mile. Three kilometers is 1.86 miles; five kilometers is 3.11 miles.
How many miles is a 10K race?
6.21 miles. The 5K is 3.11 miles, the half marathon (21.1 km) is 13.11 miles, and the full marathon (42.195 km) is 26.22 miles.
How do I convert km/h to mph?
Multiply by 0.6214 — a 100 km/h limit is 62 mph. Quick version: take 60% — accurate within 4%, always erring on the safe (slower) side.
What's a good way to estimate km to miles mentally?
Multiply by 0.6 for a floor, then add ~3%: 80 km → 48 → about 50 miles (true: 49.7). For race distances, halving and adding a quarter of the half also works: 42 km → 21 + 5.25 ≈ 26 miles.
Why does the UK use miles but buy fuel in litres?
Partial metrication: the UK switched most measures to metric but kept miles on road signs by law. The result is famously mixed arithmetic — fuel economy in miles per gallon, fuel priced per litre.