UnitConvConvert
Speed

Convert miles per hour to kilometers per hour

1 mph=1.60934km/h

Use the converter below to change any miles per hour value into kilometers per hour instantly — with formula, conversion table, and real-world examples.

1.609344

Conversion formula

Forward
kilometers per hour = miles per hour × 1.60934
Reverse
miles per hour = kilometers per hour × 0.6214

Example: 10 mph × 1.60934 = 16.0934 km/h.

About both units

From

Mile per Hour

mph

Miles per hour (mph) is the standard road-speed unit in the US, UK and a few other countries. US highways typically 65–75 mph; UK motorways 70 mph. US weather reports wind speed in mph, while meteorologists also use knots.

Real-world: US interstate: 70 mph typical. UK motorway: 70 mph limit. Cycling pro speed: 25 mph. Tornado winds: 110+ mph.
Read full mile per hour reference →
To

Kilometer per Hour

km/h

Kilometres per hour (km/h) is the standard speed unit in most of the world. European motorways typically allow 120–130 km/h; urban limits are 50 km/h. Car speedometers in metric countries are marked in km/h, often with smaller mph numbers for US and UK travel.

Real-world: German Autobahn typical speed: 130 km/h (recommended) to 180+ (no limit sections). French limit: 130 km/h. Urban: 50 km/h.
Read full kilometer per hour reference →

Mile per Hour to Kilometer per Hour conversion table

Common miles per hour to kilometers per hour values for quick reference.

Mile per Hour (mph)Kilometer per Hour (km/h)
1 mph1.60934 km/h
5 mph8.04672 km/h
10 mph16.0934 km/h
25 mph40.2336 km/h
50 mph80.4672 km/h
100 mph160.934 km/h
150 mph241.402 km/h
200 mph321.869 km/h
300 mph482.803 km/h
500 mph804.672 km/h

Tips & common mistakes

Quick tips

  • 1 mph = 1.609 km/h = 0.447 m/s.
  • Quick convert: mph × 1.6 = km/h.
  • UK speeds posted in mph on road signs despite general metrication.

Avoid these

  • Reading a UK road sign "50" as km/h — it's mph (= 80 km/h).
  • Converting mph to km/h by multiplying by 1.5 instead of 1.609 — 7% error.
  • Assuming "mph" and "MPH" differ — capitalisation does not matter.

Frequently asked questions

How many kilometers per hour in a mile per hour?
One mile per hour equals 1.60934 kilometers per hour.
How do I convert miles per hour to kilometers per hour?
Multiply the mile per hour value by 1.60934 to get the equivalent in kilometers per hour.
What is 100 miles per hour in kilometers per hour?
100 miles per hour equals 160.934 kilometers per hour.
Is a mile per hour bigger than a kilometer per hour?
Yes. 1 mile per hour equals 1.60934 kilometers per hour, so one mile per hour is larger.
How to convert miles per hour to kilometers per hour without a calculator?
Multiply by 1.61 for a quick estimate; use a calculator for precise results.

Related speed conversions

📊 See full comparison matrix →

More from Mile per Hour

mph → m/s
1 = 0.447 m/s
mph → kn
1 = 0.869 kn
mph → Ma
1 = 0.001314 Ma
mph → ft/s
1 = 1.46667 ft/s
mph → cm/s
1 = 44.704 cm/s
mph → yd/min
1 = 29.3333 yd/min
mph → in/min
1 = 1,056.83 in/min
mph → Bft
1 = 0.447 Bft

More to Kilometer per Hour

m/s → km/h
1 = 3.6 km/h
kn → km/h
1 = 1.852 km/h
Ma → km/h
1 = 1,225.04 km/h
ft/s → km/h
1 = 1.09728 km/h
cm/s → km/h
1 = 0.036 km/h
yd/min → km/h
1 = 0.05486 km/h
in/min → km/h
1 = 0.001523 km/h
Bft → km/h
1 = 3.6 km/h

Conversions in other categories

WeightKilogram → PoundLengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootEnergyKilojoule → KilocaloriePressureBar → Pound per Square InchPowerKilowatt → Mechanical Horsepower