DailyCalc

Miles per hour to Kilometers per hour (mph to km/h)

1 mph = 1.609344 km/h. Type any value to convert it.

1 mile per hour =

1.609344 km/h

kilometers per hour

Conversion factor
1 mph = 1.609344 km/h

Fix the highlighted field to update the result.

Show in all common units
1 mph in other units
UnitValue
meter per second (m/s)0.44704 m/s
kilometer per hour (km/h)1.609344 km/h
mile per hour (mph)1 mph
knot (kn)0.8689762419 kn
foot per second (ft/s)1.466666667 ft/s

How to convert miles per hour to kilometers per hour

1 mph = 1.609344 km/h

1 mph = 1.609344 km/h exactly, because the international mile is exactly 1,609.344 m (NIST SP 811 B.9).

Examples

  • 20 mph = 32.18688 km/h: Built-up area speed limit in Wales (GOV.UK)
  • 30 mph = 48.28032 km/h: Built-up area limit in England, Scotland and Northern Ireland (GOV.UK)
  • 70 mph = 112.65408 km/h: UK motorway speed limit for cars (GOV.UK)

Mph to km/h chart

Miles per hour to kilometers per hour
Miles per hour (mph)Kilometers per hour (km/h)
1 mph1.609344 km/h
2 mph3.218688 km/h
3 mph4.828032 km/h
4 mph6.437376 km/h
5 mph8.04672 km/h
10 mph16.09344 km/h
15 mph24.14016 km/h
20 mph32.18688 km/h
25 mph40.2336 km/h
30 mph48.28032 km/h
50 mph80.4672 km/h
70 mph112.65408 km/h
75 mph120.7008 km/h
100 mph160.9344 km/h

Common mistakes

  • Published equivalents are often rounded: GOV.UK lists 30 mph as 48 km/h and 70 mph as 112 km/h; the exact values are 48.28 and 112.65 km/h.

Frequently asked questions

How many km/h is 1 mph?

Exactly 1.609344 km/h.

What is 70 mph in km/h?

70 mph is about 112.7 km/h. GOV.UK rounds the UK motorway limit to 112 km/h.

What is 60 mph in km/h?

60 mph is about 96.6 km/h.

Is there a quick mental shortcut for mph to km/h?

Multiply by 1.6; it is within about 0.6%. For 50 mph that gives 80 km/h, against an exact 80.47 km/h.