Speed Converter

Convert Kilometer per Hour to Mile per Hour.

Input the value of kilometers per hour below to convert instantly to miles per hour with standard conversions, definitions, and equations.

Speed Converter

km/h

mph

Value in Miles per hour = Value in Kilometers per hour × 0.621371 Multiply the value in kilometers per hour by the conversion factor 0.621371.

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Overview

About converting kilometers per hour to miles per hour

Kilometers per hour to miles per hour is what drivers from metric countries use to make sense of US and UK speed limits and speedometers.

Since 1 mph is 1.609344 km/h, one km/h is about 0.621371 mph. To convert, multiply km/h by 0.621. So 50 km/h is 31.1 mph, 100 km/h is 62.1 mph, and 130 km/h (a common European motorway limit) is 80.8 mph.

The 0.62 factor means metric speeds always look like a smaller number in mph, which can catch out drivers crossing borders. A '100' sign in a metric country is a brisk 62 mph, not the much faster 100 mph it might suggest to someone used to imperial signage.

Practical Tips

Quick estimate: take about 60% of the km/h figure.
Anchor: 100 km/h = 62 mph is worth memorizing for motorway driving.

How to Convert Kilometers per hour to Miles per hour

To convert kilometer per hour to mile per hour, we use the official conversion formulas. Below is the mathematical formula, plain-English explanation, and a worked example.

kilometer-per-hour-to-mile-per-hour-formula.py

# Mathematical Formula

Value in Miles per hour = Value in Kilometers per hour × 0.621371

# Worked Example (5 km/h)

5 km/h × 0.621371 = 3.1069 mph

What is a Kilometer per Hour?

Kilometer per Hour (km/h)

Metric speed unit commonly used for road speeds worldwide.

What is a Mile per Hour?

Mile per Hour (mph)

Speed unit used primarily in the US and UK for road speed limits.

Kilometer per Hour to Mile per Hour Conversion Table

Kilometer per Hour (km/h)	Mile per Hour (mph)
1 km/h	0.62137 mph
2 km/h	1.24274 mph
3 km/h	1.86411 mph
5 km/h	3.10686 mph
10 km/h	6.21371 mph
15 km/h	9.32057 mph
20 km/h	12.42742 mph
25 km/h	15.53428 mph
50 km/h	31.06856 mph
100 km/h	62.13712 mph
250 km/h	155.3428 mph
500 km/h	310.6856 mph
1000 km/h	621.37119 mph

Mile per Hour to Kilometer per Hour Conversion Table

Mile per Hour (mph)	Kilometer per Hour (km/h)
1 mph	1.60934 km/h
2 mph	3.21869 km/h
3 mph	4.82803 km/h
5 mph	8.04672 km/h
10 mph	16.09344 km/h
15 mph	24.14016 km/h
20 mph	32.18688 km/h
25 mph	40.2336 km/h
50 mph	80.4672 km/h
100 mph	160.9344 km/h
250 mph	402.336 km/h
500 mph	804.672 km/h
1000 mph	1609.344 km/h

Questions

Frequently Asked Questions

How do I convert kilometers per hour to miles per hour?

Multiply the value in kilometers per hour by the conversion factor 0.621371. For example, to convert 5 kilometers per hour to miles per hour: 5 × 0.621371 = 3.1069 mph.

What is the conversion factor from kilometer per hour to mile per hour?

The conversion factor is 0.621371. One kilometer per hour is equal to 0.621371 miles per hour.

What is the reverse conversion from mile per hour to kilometer per hour?

To convert miles per hour back to kilometers per hour, multiply by 1.609344 (or divide the value by 0.621371). One mile per hour is equal to 1.609344 kilometers per hour.

How do you convert mph to km/h?

Multiply the speed in mph by 1.609344. For example, 60 mph is approximately 96.56 km/h.

What is a knot in speed?

A knot is one nautical mile per hour, which is exactly 1.852 kilometers per hour, or about 1.151 miles per hour.

Related Speed Conversions

Kilometer per Hour to Meter per Second Kilometer per Hour to Knot