Kilometers per Hour to Miles per Hour Converter
Enter a value below to convert km/h to miles per hour - one kilometer per hour is about 0.6214 mph (1 mph = 1.609344 km/h exactly). For the reverse, use our miles per hour to kilometers per hour converter.
1 km/h = 0.621371 mph. Enter a value above to convert km/h to miles per hour. Need the reverse? See mph to km/h.
Kilometer per hour
- Definition
- A kilometer per hour (symbol: km/h) is a unit of speed expressing the number of kilometers traveled in one hour. It is the metric road-speed unit; 1 km/h equals exactly 0.2777... meters per second (1/3.6 m/s) and about 0.6214 mph.
- History / origin
- The kilometer per hour follows from the metre, defined under the metric system introduced in France in the 1790s, combined with the hour. As the metric system was adopted across Europe and beyond, km/h became the standard way to mark road speeds, replacing older local units.
- Current use
- Kilometer per hour is the legal speed unit on roads in most of the world, including continental Europe, Canada, Australia and Asia. Speed-limit signs, car speedometers and transport timetables in metric countries are given in km/h.
Mile per hour
- Definition
- A mile per hour (symbol: mph) is a unit of speed in the imperial and US customary systems, equal to one statute mile traveled in one hour. Since a mile is exactly 1,609.344 meters, 1 mph equals exactly 1.609344 km/h, or 0.44704 meters per second.
- History / origin
- The mile per hour grew out of the statute mile, a unit fixed in English law under Elizabeth I in 1593 at 5,280 feet. As road and rail travel spread, miles per hour became the natural way to state vehicle speeds in English-speaking countries, and it was carried onto speedometers and speed-limit signs.
- Current use
- Miles per hour is the standard road-speed unit in the United States and the United Kingdom, where speed limits, speedometers and weather wind speeds are quoted in mph. It is also used in a handful of other countries and territories that retain imperial road signage.
Kilometer per hour to mile per hour conversion table
| Kilometer per hour [km/h] | Mile per hour [mph] |
|---|---|
| 1 km/h | 0.6213711922 mph |
| 5 km/h | 3.1068559612 mph |
| 10 km/h | 6.2137119224 mph |
| 20 km/h | 12.4274238447 mph |
| 30 km/h | 18.6411357671 mph |
| 50 km/h | 31.0685596119 mph |
| 60 km/h | 37.2822715342 mph |
| 80 km/h | 49.709695379 mph |
| 100 km/h | 62.1371192237 mph |
| 120 km/h | 74.5645430685 mph |
| 130 km/h | 80.7782549909 mph |
| 160 km/h | 99.419390758 mph |
Popular kilometer per hour to mile per hour conversions
Common road and motorway speeds in mph, rounded to two decimals - the km/h values drivers look up most.
| Kilometer per hour [km/h] | Mile per hour [mph] |
|---|---|
| 30 km/h | 18.64 mph |
| 50 km/h | 31.07 mph |
| 60 km/h | 37.28 mph |
| 80 km/h | 49.71 mph |
| 100 km/h | 62.14 mph |
| 110 km/h | 68.35 mph |
| 120 km/h | 74.56 mph |
| 130 km/h | 80.78 mph |
| 140 km/h | 86.99 mph |
| 160 km/h | 99.42 mph |
How to convert kilometers per hour to miles per hour
To convert kilometers per hour to miles per hour, multiply the number of kilometers per hour by 0.6213711922. For example, 100 km/h × 0.6213711922 = 62.14 mph (or divide by 1.609344).
One mile is exactly 1,609.344 meters, so one kilometer per hour is 1 ÷ 1.609344 = 0.6213711922 miles per hour. To convert a speed in km/h to mph you divide by 1.609344, or equivalently multiply by 0.6213711922:
mph = km/h ÷ 1.609344 = km/h × 0.6213711922
1 km/h = 0.6213711922 mph · 1 mph = 1.609344 km/h
Example. To convert a 130 km/h motorway limit to mph, multiply by 0.6213711922: 130 km/h = 130 × 0.6213711922 = 80.78 mph. Going the other way, 60 mph is 60 × 1.609344 = 96.56 km/h.
When you need to convert kilometers per hour to miles per hour
Km/h-to-mph conversion is what you reach for when a metric speed has to be read in imperial units. Common cases:
- Visiting the United States or United Kingdom and reading mph signs after driving in km/h at home.
- Checking a car's km/h top speed or test data against figures published in mph.
- Switching a speedometer, dash-cam or GPS display from metric to mph for an mph-based country.
- Converting a metric weather forecast's wind speed into the mph used in US and UK reports.
- Importing running, cycling or sailing speeds recorded in km/h into an mph-based app or log.
Frequently asked questions
How many mph is 1 km/h?
One kilometer per hour equals 0.6214 mph (0.6213711922 mph to be exact) - a little under two-thirds of a mile per hour.
How do I convert km/h to mph?
Multiply the number of kilometers per hour by 0.6213711922, or divide by 1.609344. For example, 100 km/h = 100 × 0.6213711922 = 62.14 mph.
What is 100 km/h in mph?
100 km/h equals 62.14 mph (62.1371192237 mph to be exact). That is a typical open-road or highway speed limit.
What is 130 km/h in mph?
130 km/h equals 80.78 mph (80.778255 mph to be exact). It is a common motorway limit across continental Europe.
Is 1 km/h about 0.62 mph?
Yes. One kilometer per hour is 0.6213711922 mph, which rounds to 0.62 mph; a kilometer is shorter than a mile, so the number gets smaller.
How do I convert km/h to mph in my head?
Multiply by about 0.6 - or take roughly 40 percent off. For example, 80 km/h is about 80 × 0.6 = 48 mph, a little under the exact 49.71 mph.
What is 50 km/h in mph?
50 km/h equals 31.07 mph (31.06855961 mph to be exact). It is the standard urban speed limit in many countries.
What is 60 mph in km/h?
60 mph equals 96.56 km/h. To convert mph to km/h, multiply by 1.609344.
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