Miles to KM Converter
Free miles to km converter — miles to kilometres with the exact factor 1 mi = 1.609344 km. Instant, two-way, race distances included.
About the Miles to KM Converter
Convert miles to kilometres using the exact factor 1 mile = 1.609344 km. Enter a distance in miles and the kilometres appear instantly — 5 miles is 8.047 km — with the conversion working both ways as you edit either field.
This is the traveller's and runner's conversion: US road distances and UK signposts use miles while most of the world uses kilometres. A 26.2-mile marathon is 42.16 km (officially 42.195 km), a 100-mile drive is 160.9 km, and 60 mph is roughly 96.6 km/h.
Quick mental math: multiply miles by 1.6 — or add 60% — so 50 miles ≈ 80 km. The reference table below includes typical race distances (3.1 mi = 5K, 13.1 mi = half marathon) and round-trip figures up to 1,000 miles.
How to Use the Miles to KM Converter
- 1Enter a distance in miles — for example 26.2 for a marathon.
- 2Read the kilometre result instantly (26.2 mi = 42.16 km).
- 3Type kilometres instead to convert back to miles.
- 4Check the table for race distances and common road-trip figures.
Frequently Asked Questions
How many km is 1 mile?
1 mile is exactly 1.609344 km. Reversed, 1 km is 0.62137 miles — about five-eighths of a mile.
How many km is 26.2 miles?
26.2 miles is 42.16 km. The official marathon distance is 42.195 km, which equals 26.219 miles — 26 miles and 385 yards.
What is 60 mph in km/h?
60 mph is 96.56 km/h. Other useful speeds: 30 mph = 48.3 km/h, 70 mph (UK motorway limit) = 112.7 km/h and 100 mph = 160.9 km/h.
How do I convert miles to km in my head?
Multiply by 1.6: 25 miles × 1.6 = 40 km (exact: 40.23). Or use adjacent Fibonacci numbers, which approximate the golden-ratio-like factor: 5 mi ≈ 8 km, 8 mi ≈ 13 km.
Why is a mile 1.609344 km exactly?
A mile is 5,280 feet, and the international foot is exactly 0.3048 m, so 5,280 × 0.3048 = 1,609.344 m. Since 1959 this has been an exact defined value, which is what this converter uses.