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Convert mile per hour to kilometer per hour

Here you can quickly calculate how many kilometer per hour fit in one mile per hour.
write a number and we convert instantly
swap direction → km/s

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  • 1 mph = 1.609344 km/h
  • 1 km/h = 0.621371 mph

Example: mile per hour to kilometer per hour

  • 1 mile per hour = 1.609344 kilometer per hour

Mile per hour to kilometer per hour conversion table

mile per hour kilometer per hour
1 1.609344
2 3.218688
5 8.04672
10 16.09344
20 32.18688
50 80.4672
100 160.9344

Mile per hour to kilometer per hour formula

To convert mile per hour to kilometer per hour, multiply by 1.609344.

1 mph = 1.609344 km/h
Example: 1 mile per hour = 1.609344 kilometer per hour

Common speed conversion mistakes

  • A knot is one nautical mile per hour, exactly 1.852 km/h, not 1 km/h. A boat doing 20 knots travels at about 37 km/h. Multiply knots by 1.852 to get km/h.
  • Between m/s and km/h the factor is 3.6, an hour has 3,600 seconds and a kilometer 1,000 meters. Multiply m/s by 3.6 to get km/h (10 m/s = 36 km/h) and divide going the other way. Flipping the factor produces a thirteen-fold error.
  • UK and US road signs show miles per hour, not km/h. 1 mph is about 1.609 km/h, so a '70' limit means about 113 km/h. Multiply mph by 1.6 to think in km/h.

Quick mile per hour and kilometer per hour conversion quiz

Score: 0

52 mile per hour equals 83.7 kilometer per hour.

Correct answer: 52 mile per hour = 83.7 kilometer per hour.

5.4 mile per hour equals 8.69 kilometer per hour.

Correct answer: 5.4 mile per hour = 8.69 kilometer per hour.

239 mile per hour equals 385 kilometer per hour.

Correct answer: 239 mile per hour = 385 kilometer per hour.

100 mile per hour equals 145 kilometer per hour.

Correct answer: 100 mile per hour = 161 kilometer per hour.

More speed conversions