MPH to KM/H Converter
Convert miles per hour to kilometers per hour instantly. 1 mph = 1.609344 km/h, worked steps and a full reference table.
How to use it
- Type the value in miles per hour — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 mph | 1.609344 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 100 mph | 160.9344 km/h |
One miles per hour equals 1.609344 kilometers per hours (km/h). To convert miles per hours to kilometers per hours, multiply by 1.609344; to go back the other way, multiply by 0.62137119 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What miles per hours and kilometers per hours actually measure
Miles per hour (mph) — Miles per hour. Road speeds in the US and UK.
Kilometers per hour (km/h) — Kilometres per hour is the everyday metric speed unit. Road speed limits and vehicle speedometers in most countries.
MPH to KM/H conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| mph | km/h |
|---|---|
| 1 mph | 1.609344 km/h |
| 2 mph | 3.218688 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
How to convert miles per hours to kilometers per hours by hand
Multiply the number of miles per hours by 1.609344.
For example, 25 mph × 1.609344 = 40.2336 km/h.
Going the other way, divide by 1.609344 — or multiply by 0.62137119, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many km/h are in 1 mph?
1 mph equals exactly 1.609344 km/h. Multiply any value in miles per hour by 1.609344 to get kilometers per hour.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026