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Miles to KM converter

Convert miles to kilometers (and back) with the exact 1.609344 factor — road distances, running races, and speed limits, converted as you type.

1 mi = 1.609344 km

1 mi = 1.609344 km · multiply by 1.609344

Conversions run instantly on your device — nothing is sent anywhere.

Maintained by ToolsNexus

Convert miles to kilometers — and back — using the exact factor (1 mi = 1.609344 km, which follows from the 1959 foot definition). Loads with mi → km preselected.

The formula

km = miles × 1.609344 · miles = km × 0.62137119 (that reverse factor is 1 ÷ 1.609344 — the converter’s formula line shows it when you swap). Mental math: add 60%, or use the Fibonacci trick from the FAQ.

Common values

miles km miles km
1 1.609 26.2 42.16
3.1 4.99 (5K) 50 80.47
5 8.05 100 160.93
6.2 9.98 (10K) 200 321.87
10 16.09 500 804.67
13.1 21.08 (half) 1,000 1,609.34

Race distances and road trips

Running is where the two systems collide hardest: races are defined in km (5K, 10K, 42.195 km marathon) but US runners train in miles — the table above has the classic equivalents. Driving: a 300-mile US road trip is 483 km; a 100 km European sign means 62 miles to go. Fuel economy inverts the logic (mpg vs L/100 km) and speed has its own page — the km/h to mph converter — because limits are posted per hour, not per trip.

Private by design

The math runs on your device as you type — no server, no logging. All 46 units live in the full unit converter.

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Frequently asked questions

What is the exact miles to km formula?
Multiply miles by 1.609344 — exact by definition, since a mile is 5,280 feet and a foot is exactly 0.3048 m. So 5 miles = 8.04672 km, precisely. Reverse: divide kilometers by 1.609344 (or multiply by 0.62137119).
How long is a marathon in miles and kilometers?
The marathon is defined in metric: 42.195 km, which is 26.219 miles — the familiar "26.2". A half marathon is 21.0975 km = 13.11 miles; a 10K is 6.21 miles; a 5K is 3.11 miles.
What is the Fibonacci shortcut for miles and km?
Consecutive Fibonacci numbers happen to sit near the 1.609 ratio: 5 mi ≈ 8 km, 8 mi ≈ 13 km, 13 mi ≈ 21 km, 21 mi ≈ 34 km. The real conversions are 8.05, 12.87, 20.92, and 33.80 km — within about 1%. Delightful, but use the converter for anything that matters.
Why do the US and UK still use miles?
Road infrastructure: both countries signpost distances and speed limits in miles, so odometers and speedometers follow. Most of the rest of the world drives in kilometers — which is why rental-car dashboards and race distances are the classic conversion moments.

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