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

Convert miles per hour to kilometres per hour (× 1.609344), with a table of common speed limits.

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Frommile per hour (mph)
1
Tokilometre per hour (km/h)
1.6
Decimals1 decimal

Formula: km/h = mph × 1.609344

1 mph = 1.6 km/h

Common values: mile per hour to kilometre per hour

mphkm/h
5 mph8 km/h
10 mph16.1 km/h
15 mph24.1 km/h
20 mph32.2 km/h
25 mph40.2 km/h
30 mph48.3 km/h
35 mph56.3 km/h
40 mph64.4 km/h
45 mph72.4 km/h
50 mph80.5 km/h
55 mph88.5 km/h
60 mph96.6 km/h
65 mph104.6 km/h
70 mph112.7 km/h
75 mph120.7 km/h
80 mph128.7 km/h
100 mph160.9 km/h
120 mph193.1 km/h

How it works

km/h = mph × 1.609344, the length of a mile in kilometres, because both are "per hour". The UK motorway limit of 70 mph is 112.65 km/h, a US 65 mph limit is 104.6 km/h and a 30 mph urban limit is 48.28 km/h.

Drivers renting a car in the US or UK, reading a speedometer with only an mph scale, or comparing car top speeds between brochures are the typical users. Going the other way, divide km/h by 1.609344: 120 km/h is 74.56 mph.

How to convert miles per hour to kilometres per hour

Formula: km/h = mph × 1.609344.

Multiply the mph value by 1.609344, the number of kilometres in a mile; the "per hour" part is the same on both sides. Worked example for a 65 mph US highway limit: 65 × 1.609344 = 104.61 km/h.

For metres per second (used in physics and wind reports), multiply mph by 0.44704: 65 mph = 29.06 m/s. For knots, multiply by 0.868976.

mph to km/h chart

Each row is computed with the same exact factor as the converter above and rounded only for display.

mphkm/hm/sKnots
5 mph8 km/h2.24 m/s4.3 kn
10 mph16.1 km/h4.47 m/s8.7 kn
15 mph24.1 km/h6.71 m/s13 kn
20 mph32.2 km/h8.94 m/s17.4 kn
25 mph40.2 km/h11.18 m/s21.7 kn
30 mph48.3 km/h13.41 m/s26.1 kn
35 mph56.3 km/h15.65 m/s30.4 kn
40 mph64.4 km/h17.88 m/s34.8 kn
45 mph72.4 km/h20.12 m/s39.1 kn
50 mph80.5 km/h22.35 m/s43.4 kn
55 mph88.5 km/h24.59 m/s47.8 kn
60 mph96.6 km/h26.82 m/s52.1 kn
65 mph104.6 km/h29.06 m/s56.5 kn
70 mph112.7 km/h31.29 m/s60.8 kn
75 mph120.7 km/h33.53 m/s65.2 kn
80 mph128.7 km/h35.76 m/s69.5 kn
85 mph136.8 km/h38 m/s73.9 kn
100 mph160.9 km/h44.7 m/s86.9 kn
120 mph193.1 km/h53.64 m/s104.3 kn
150 mph241.4 km/h67.06 m/s130.3 kn
200 mph321.9 km/h89.41 m/s173.8 kn

Everyday miles per hour-to-kilometres per hour examples

  • A 20 mph zone around UK schools and residential streets: 20 mph = 32.2 km/h.
  • A 30 mph limit on a UK town road: 30 mph = 48.3 km/h.
  • The UK motorway limit: 70 mph = 112.7 km/h.
  • A common US rural highway limit: 55 mph = 88.5 km/h.
  • A brisk cycling pace: 15 mph = 24.1 km/h.

How to use it

  1. Type the value in the first box; the converted value appears in the second box as you type.
  2. Or type in the second box to convert the other way.
  3. Use the Decimals menu to round, and the quick-reference table for common values.

Frequently asked questions

How many km/h is 1 mph?

Exactly 1.609344 km/h.

How many km/h is 70 mph?

112.65 km/h.

How do I convert mph to km/h in my head?

Multiply by 1.6: 60 mph → 96 km/h (exact 96.56).

What about m/s or knots?

Use the speed converter: 1 mph = 0.44704 m/s and 0.868976 knots.

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