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Kilometers per Hour to Miles per Hour (km/h to mph) Converter

1 kilometer per hour (km/h) = 0.621371 miles per hour (mph). To convert kilometers per hour to miles per hour, multiply by 0.621371: 100 km/h × 0.621371 = 62.1371 mph. Also searched as kph to mile per hour, kmph to mile per hour, kilometres per hour to miles per hour.

1 km/h = 0.6213711923 mph
Convert the other way: Miles per Hour to Kilometers per Hour

Quick facts

How to convert kilometers per hour to miles per hour

  1. Take the value in kilometers per hour.
  2. Multiply it by 0.621371 (the number of miles per hour in one kilometer per hour).
  3. Round the result to the precision you need.
mph = km/h × 0.621371

Worked example (motorway driving): 100 km/h × 0.621371 = 62.1371 mph.

To convert miles per hour back to kilometers per hour, multiply by 1.60934, or divide by 0.621371.

Source: NIST SP 811 (2008), derived from the metre, the international mile and the second.

Kilometers per Hour to Miles per Hour conversion table

Kilometers per Hour to Miles per Hour conversion table
Kilometers per Hour [km/h]Miles per Hour [mph]
0.01 km/h0.0062137119 mph
0.1 km/h0.0621371192 mph
1 km/h0.6213711923 mph
2 km/h1.2427423846 mph
3 km/h1.8641135769 mph
5 km/h3.1068559614 mph
10 km/h6.2137119229 mph
20 km/h12.4274238457 mph
50 km/h31.0685596144 mph
100 km/h62.1371192287 mph
1000 km/h621.371192287 mph

km/h to mph chart from 1 to 100

Miles per Hour to Kilometers per Hour conversion table

Miles per Hour to Kilometers per Hour conversion table
Miles per Hour [mph]Kilometers per Hour [km/h]
0.01 mph0.01609344 km/h
0.1 mph0.1609344 km/h
1 mph1.6093439999 km/h
2 mph3.2186879997 km/h
3 mph4.8280319996 km/h
5 mph8.0467199994 km/h
10 mph16.0934399987 km/h
20 mph32.1868799974 km/h
50 mph80.4671999936 km/h
100 mph160.9343999871 km/h
1000 mph1609.3439998713 km/h

Kilometers per Hour vs Miles per Hour

Kilometer per HourMile per Hour
Symbolkm/hmph
Equals1 km/h = 0.621371 mph1 mph = 1.60934 km/h

What is a kilometer per hour?

Distance in kilometers covered in one hour. The standard speed unit for driving and weather worldwide outside the US.

What is a mile per hour?

Distance in miles covered in one hour. The standard speed unit for driving and wind speed in the US and UK.

Frequently asked questions

How many miles per hour are in a kilometer per hour?

There are 0.621371 miles per hour in 1 kilometer per hour (1 km/h = 0.6213711923 mph).

How many kilometers per hour are in a mile per hour?

There are 1.60934 kilometers per hour in 1 mile per hour (1 mph = 1.6093439999 km/h).

How do I convert kilometers per hour to miles per hour?

Multiply the number of kilometers per hour by 0.621371. For example, 10 km/h × 0.621371 = 6.21371 mph. To convert back, multiply by 1.60934.

What is 10 km/h in miles per hour?

10 km/h = 6.21371 mph.

What is 100 km/h in miles per hour?

100 km/h = 62.1371 mph.

Is the conversion exact?

Yes. The factor comes from the official definitions of both units (NIST SP 811 (2008), derived from the metre, the international mile and the second). Results are shown to up to 10 decimal places; round them to suit your purpose.

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Reviewed by

Dr. Muhammad Amjad Khadim PhD Mathematics

Dr. Muhammad Amjad Khadim holds a PhD in Mathematics. He writes and reviews the guides on pakmath.com and checks every formula, conversion factor and worked example against published standards and official guidance before it goes live. Spotted an error? Tell us and it will be corrected.

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First published 28 October 2026 · Last reviewed 5 November 2026