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Miles per hour to Kilometres per hour

1 mile per hour = 1.6093 kilometres per hour · 1 km/h = 0.62137 mph

1 mile per hour = 1.6093 kilometres per hour

How it’s calculated

km/h = mph × 1.609344

  • Multiply the value in miles per hour by 1.609344.
  • To go back, divide by 1.609344 (or multiply by 0.6213711922).
  • 1 mph = 1.609344 km/h · 1 km/h = 0.6213711922 mph
Show worked solutionFactor, unit cancellation and rounding, step by step

  1. Find the conversion factor

    By definition 1 mph = 0.44704 m/s and 1 km/h = 0.277777777777778 m/s, so 1 mph = 1.609344 km/h. Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.) (SI prefixes and accepted units).

  2. Multiply by the factor written as a fraction

    Put mph in the denominator so it cancels, leaving km/h.

  3. Calculate (unrounded)

  4. Round the answer

    Rounded to 5 significant figures.

Answer: 1.6093 km/h

1 mph in other units

Batch convert mph → km/h
Results
  1. 1 mph = 1.6093 km/h
  2. 5 mph = 8.0467 km/h
  3. 10 mph = 16.093 km/h
  4. 25 mph = 40.234 km/h

Permanent link to this conversion

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Quick examples

  • 1 mile per hour = 1.6093 kilometres per hour
  • 5 miles per hour = 8.0467 kilometres per hour
  • 10 miles per hour = 16.093 kilometres per hour
  • 25 miles per hour = 40.234 kilometres per hour
  • 100 miles per hour = 160.93 kilometres per hour

About these units

Mile per hour (mph)

US & imperial (identical)

Exactly 0.447 04 m/s.

1 mph = 0.44704 m/s

Source: NIST SP 811 / Handbook 44

Kilometre per hour (km/h)

metric (non-SI)

1 km/h = 0.2777777778 m/s

Source: BIPM SI Brochure (9th ed.) (SI prefixes and accepted units)

Miles per hour to kilometres per hour conversion table

mile per hour (mph) to kilometre per hour (km/h)
Miles per hour (mph)Kilometres per hour (km/h)
0.1 mph0.16093 km/h
0.5 mph0.80467 km/h
1 mph1.6093 km/h
2 mph3.2187 km/h
3 mph4.828 km/h
4 mph6.4374 km/h
5 mph8.0467 km/h
6 mph9.6561 km/h
7 mph11.265 km/h
8 mph12.875 km/h
9 mph14.484 km/h
10 mph16.093 km/h
15 mph24.14 km/h
20 mph32.187 km/h
25 mph40.234 km/h
30 mph48.28 km/h
40 mph64.374 km/h
50 mph80.467 km/h
75 mph120.7 km/h
100 mph160.93 km/h
250 mph402.34 km/h
500 mph804.67 km/h
1,000 mph1,609.3 km/h

Related conversions

Frequently asked questions

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

Use km/h = mph × 1.609344. Multiply the value in miles per hour by 1.609344.

How many kilometres per hour are in 1 mile per hour?

1 mile per hour (mph) equals 1.6093 kilometres per hour (km/h); more precisely 1.609344.

How many miles per hour are in 1 kilometre per hour?

1 kilometre per hour (km/h) equals 0.62137 miles per hour (mph); more precisely 0.6213711922.

What is 10 mph in km/h?

10 miles per hour = 16.093 kilometres per hour.

What is a mile per hour?

Exactly 0.447 04 m/s.

Formula: km/h = mph × 1.609344. Factors last reviewed 2026-10-27.