KM/H to MPH Converter
Divide a speed in kilometers per hour by 1.609344 to get miles per hour. 100 km/h = 62.1371192237 mph, so a 100 km/h limit is a little over 62 mph.
kmh and kph are common ways of typing km/h, so kmh to mph and kph to mph mean the same thing. Enter a value in either box below.
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(opens in a new tab)How to convert kilometers per hour to miles per hour
Formula: miles per hour = kilometers per hour / 1.609344
The constant is exact by definition: 1 mile per hour = 1.609344 kilometers per hour. It is not a rounded approximation.
A mile per hour is the faster of the two units, so the mph figure is always the smaller number. Dividing by 1.609344 gives a result that does not end, so the values below are shown to 12 significant digits.
Worked example: 100 km/h to miles per hour
The answer below is shown to 12 significant digits. The full value has more digits, so treat the displayed figure as rounded.
Convert 100 km/h
Input
100 km/h
Output
100 / 1.609344 = 62.1371192237 mph
Common kilometers per hour to miles per hour conversions
| Kilometers per hour (km/h) | Miles per hour (mph) |
|---|---|
| 1 km/h | 0.621371192237 mph |
| 10 km/h | 6.21371192237 mph |
| 30 km/h | 18.6411357671 mph |
| 50 km/h | 31.0685596119 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 |
When you need to convert kilometers per hour to miles per hour
- Speed limits on km/h signs when your car shows mph: 50 km/h = 31.0685596119 mph and 120 km/h = 74.5645430685 mph.
- Rental cars abroad with a speedometer in a unit you do not usually use.
- Wind speeds in weather reports given in km/h.
- Cycling and running speeds from a fitness app set to metric units.
Things worth knowing
- Countries that sign speeds in km/h tend to use round numbers such as 50, 80, 100 and 130. Their mph equivalents are not round, so a dashboard reading of 62 mph is close to, not exactly, 100 km/h.
- Ships and aircraft usually measure speed in knots. The Unit Converter converts knots to km/h or mph.
Converting back and related converters
To go the other way, use the MPH to KM/H Converter, which applies kilometers per hour = miles per hour × 1.609344. For any other pair of units, open the Unit Converter, or browse every unit converter.
- KM to Miles Converter: to convert a distance in kilometers rather than a speed.
- Miles to KM Converter: for road distances on mile-based signs.
Frequently asked questions
How many mph is 100 km/h?
100 km/h = 62.1371192237 mph. The figure is rounded to 12 significant digits, because dividing by 1.609344 does not end.
What does kph mean?
Kilometers per hour. It is another way of writing km/h, so this page converts it to miles per hour as well.
Is there a quick way to convert km/h to mph?
Multiply by 5/8, or by 0.625. For 80 km/h that gives 50 mph against an exact 49.709695379 mph. It runs about 0.6 percent high.
Is 120 km/h faster than 70 mph?
Yes, slightly. 120 km/h = 74.5645430685 mph, which is a little over 74 mph.