Km/h to mph converter
Type a speed in kilometres per hour and see at once how many miles per hour (mph) that is. Converting from mph to km/h works too. Handy when you drive in the US or the UK.
In kilometres per hour or in miles per hour (mph).
Fill in the fields; the answer appears here straight away.
How it's worked out
How it works
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Enter the values
Type the numbers or the formula. Decimals may use a point or a comma. No idea? Click Fill in an example.
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Instant answer
The answer appears as you type, with the most important intermediate values.
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See the working
Under "How it's worked out" you see the steps, handy for checking your own calculation.
The formula
One mile is 1.609344 km, so:
- km/h to mph: divide by 1.609344 (or multiply by 0.621371)
- mph to km/h: multiply by 1.609344
120 km/h is 120 รท 1.609344 = 74.6 mph.
Conversion table
| km/h | mph | |---|---| | 10 km/h | 6.2 mph | | 30 km/h | 18.6 mph | | 50 km/h | 31.1 mph | | 70 km/h | 43.5 mph | | 80 km/h | 49.7 mph | | 100 km/h | 62.1 mph | | 120 km/h | 74.6 mph | | 130 km/h | 80.8 mph | | 150 km/h | 93.2 mph | | 200 km/h | 124.3 mph |
A rule of thumb
Multiply km/h by 0.6 to get mph: 100 km/h is about 60 mph (exactly 62.1). A speed limit of 65 mph is about 105 km/h.
Frequently asked questions
Is the km/h to mph free?
Yes. The km/h to mph is completely free, with no account, sign-up or usage limit.
How accurate is the result?
The tool calculates with your browser's number precision. For important calculations, always double-check what you entered.
Does it work on my phone?
Yes. The tool works in any modern browser on a phone, tablet or computer.