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Convert mph to kph
Convert miles per hour (mph) to kilometer per hour (km/h) instantly. Free, no signup, nothing is uploaded — everything runs in your browser.
Miles per hour to Kilometer per hour conversion table
| Miles per hour [mph] | Kilometer per hour [km/h] |
|---|---|
| 0.01 | 0.01609344 |
| 0.1 | 0.1609344 |
| 1 | 1.609344 |
| 2 | 3.218688 |
| 3 | 4.828032 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 20 | 32.18688 |
| 50 | 80.4672 |
| 100 | 160.9344 |
| 1,000 | 1,609.344 |
How to convert miles per hour to kilometer per hour
kph = mph × 1.60934
Example: 60 mph = 60 × 1.60934 = 96.5606 km/h
To convert back (kilometer per hour to miles per hour): mph = kph ÷ 1.60934
What is a miles per hour?
Miles per hour (mph) is a unit of speed in the US customary and imperial systems, expressing the number of miles traveled in one hour. The standard unit for road speed limits in the United States and the United Kingdom.
What is a kilometer per hour?
Kilometers per hour (km/h) is a unit of speed in the metric system, expressing the number of kilometers traveled in one hour. The standard unit for road speed limits in most of the world.
When do you need to convert miles per hour to kilometer per hour?
Driving abroad: US drivers in Europe, the UK, Australia, and most of the rest of the world see speed limit signs in km/h and need mph to know what they mean. A European 50 km/h limit is 31.07 mph (a typical US residential street); a 130 km/h Autobahn limit is 80.78 mph. Misjudging by 20 mph can mean a speeding ticket or a crash.
Speedometer readings: many US car speedometers include a smaller kph scale, but the primary is mph. European and Asian cars are the reverse. A US-spec car imported to Europe needs the speedometer recalibrated (or the driver needs to convert mentally) for kph roads. A driver who thinks they are going 60 in a 50 km/h zone is actually going 96.56 km/h — almost double the limit.
Cycling and running: most cycling computers and running watches default to one unit or the other. A bike computer set to mph needs kph for a European ride; a Strava segment in another country is uploaded in whatever unit the rider used. Tour de France climbs are graded in % gradient, but speeds during the climb are in km/h; US cycling apps need the conversion.
Frequently asked questions
How many kph is 60 mph?
60 mph = 96.56 km/h, the typical US highway speed limit converted to metric. 65 mph = 104.61 km/h, 70 mph = 112.65 km/h, 75 mph = 120.70 km/h, 80 mph = 128.75 km/h.
How many mph is 100 kph?
100 km/h = 62.14 mph, the reverse. Common conversions: 50 km/h = 31.07 mph (residential), 80 km/h = 49.71 mph (urban arterial), 100 km/h = 62.14 mph (highway), 120 km/h = 74.56 mph (Autobahn), 130 km/h = 80.78 mph (high-speed Autobahn).
Why 1.60934 and not 1.6?
Because 1 international mile = 1,609.344 m exactly (1959 yard agreement). 1 mph = 1 mi/hr = 1,609.344 m/hr = 1.609344 km/h. Rounded to 5 decimal places: 1.60934. Using 1.6 introduces a 0.58% error — about 0.6 km/h at 100 km/h, not much, but accumulates over long distances or in safety-critical contexts.
What about kph for wind speed?
Wind speed uses the same conversion: 1 mph wind = 1.60934 km/h wind. The Beaufort scale uses knots (1 kt = 1.852 km/h = 1.15078 mph), not km/h, for historical reasons. For weather, most countries report wind in km/h, but marine forecasts use knots. A 20 mph breeze is 32.19 km/h or 17.40 knots.