Speed Converter

Convert Mile per Hour to Kilometer per Hour.

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

Speed Converter

mph

km/h

Value in Kilometers per hour = Value in Miles per hour × 1.609344 Multiply the value in miles per hour by the conversion factor 1.609344.

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Overview

About converting miles per hour to kilometers per hour

Miles per hour to kilometers per hour is the driving conversion for anyone reading US or UK speed limits, car specs, or weather wind speeds in metric terms.

One mile per hour equals 1.609344 km/h, the same ratio as miles to kilometers, so converting mph to km/h means multiplying by about 1.609. A 30 mph residential limit is 48.3 km/h, 60 mph is 96.6 km/h, and 70 mph is 112.7 km/h.

Because the conversion is identical to the distance ratio, dual-marked speedometers simply print two scales against the same needle. The figures rarely line up on round numbers, which is why 100 km/h (62 mph) and 60 mph (97 km/h) never quite match across the two systems.

Practical Tips

Quick estimate: multiply mph by 1.6.
Common limits: 25 mph ≈ 40 km/h, 50 mph ≈ 80 km/h, 70 mph ≈ 113 km/h.

How to Convert Miles per hour to Kilometers per hour

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

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

# Mathematical Formula

Value in Kilometers per hour = Value in Miles per hour × 1.609344

# Worked Example (5 mph)

5 mph × 1.609344 = 8.0467 km/h

What is a Mile per Hour?

Mile per Hour (mph)

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

What is a Kilometer per Hour?

Kilometer per Hour (km/h)

Metric speed unit commonly used for road speeds worldwide.

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

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

Questions

Frequently Asked Questions

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

Multiply the value in miles per hour by the conversion factor 1.609344. For example, to convert 5 miles per hour to kilometers per hour: 5 × 1.609344 = 8.0467 km/h.

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

The conversion factor is 1.609344. One mile per hour is equal to 1.609344 kilometers per hour.

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

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

Mile per Hour to Meter per Second Mile per Hour to Knot