Converter

Convert miles per hour to kilometres per hour

miles per hour (mph)

kilometres per hour (km/h)

1.6093

Formula: km/h = mph × 1.6093

mph to km/h quick reference table

miles per hour (mph)	kilometres per hour (km/h)
1	1.6093
2	3.2187
5	8.0467
10	16.0934
20	32.1869
25	40.2336
50	80.4672
100	160.934
250	402.336
500	804.672
1,000	1,609.34

Everyday mph values, converted

30 mph = 48.2803 km/h — a residential speed limit.
70 mph = 112.654 km/h — a UK motorway limit.

Where mph to km/h comes up

Speed conversions matter when driving abroad, reading a foreign weather report or setting a treadmill. Getting a speed limit wrong is the one conversion with a fine attached.

Doing mph to km/h in your head

Add half again plus a tenth, or use the 5:8 rule in reverse — 8 kilometres is about 5 miles. 10 miles becomes roughly 16 km.

Precision and rounding

One mile per hour is exactly 1.6093 kilometres per hour under the current definitions of both units, so the only judgement call is how many digits you keep. Two decimal places is already finer than most household scales and tape measures can read, while engineering and medical work usually keeps the full factor and rounds once at the end rather than at every step.

Frequently Asked Questions & How-To

1 mile per hour equals 1.6093 kilometres per hour. 10 miles per hour is 16.0934 kilometres per hour, and 100 miles per hour is 160.934 kilometres per hour.

The conversion uses km/h = mph × 1.6093. Type any amount above and the result updates as you type — no button press and no page reload.

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