Speed Unit Converter
MPH to KM/H Converter
Instantly convert between miles per hour and kilometers per hour. Free online converter with common speed conversions and formula explanation.
Convert Speed Units
Enter a value in either field to convert automatically
Common MPH to KM/H Conversions
Quick reference table for frequently searched speed conversions
| MPH | KM/H | Context |
|---|---|---|
| 3.1 mph | 4.99 km/h | Walking pace |
| 5 mph | 8.05 km/h | Brisk walk |
| 10 mph | 16.09 km/h | Jogging |
| 15 mph | 24.14 km/h | Cycling |
| 20 mph | 32.19 km/h | City driving |
| 25 mph | 40.23 km/h | Residential area |
| 27.8 mph | 44.74 km/h | Usain Bolt top speed |
| 30 mph | 48.28 km/h | Urban speed limit |
| 35 mph | 56.33 km/h | Suburban road |
| 40 mph | 64.37 km/h | Main road |
| 45 mph | 72.42 km/h | Highway on-ramp |
| 50 mph | 80.47 km/h | Rural road |
| 55 mph | 88.51 km/h | US highway |
| 60 mph | 96.56 km/h | Highway |
| 65 mph | 104.61 km/h | US Interstate |
| 70 mph | 112.65 km/h | Motorway |
| 75 mph | 120.70 km/h | US Interstate max |
| 80 mph | 128.75 km/h | Autobahn advisory |
| 85 mph | 136.79 km/h | High speed limit |
| 100 mph | 160.93 km/h | Sports car |
| 120 mph | 193.12 km/h | Fast driving |
| 150 mph | 241.40 km/h | Supercar |
| 200 mph | 321.87 km/h | Race car |
| 250 mph | 402.33 km/h | Formula 1 |
| 767 mph | 1234.36 km/h | Speed of sound |
Common KM/H to MPH Conversions
| KM/H | MPH | Context |
|---|---|---|
| 5 km/h | 3.11 mph | Walking |
| 10 km/h | 6.21 mph | Brisk walk |
| 20 km/h | 12.43 mph | Jogging |
| 30 km/h | 18.64 mph | City limit |
| 50 km/h | 31.07 mph | Urban area |
| 60 km/h | 37.28 mph | Suburban |
| 80 km/h | 49.71 mph | Rural road |
| 100 km/h | 62.14 mph | Highway |
| 110 km/h | 68.35 mph | Motorway |
| 120 km/h | 74.56 mph | Autobahn |
| 130 km/h | 80.78 mph | Fast motorway |
| 150 km/h | 93.21 mph | Sports car |
| 200 km/h | 124.27 mph | Supercar |
| 250 km/h | 155.34 mph | High performance |
| 300 km/h | 186.41 mph | Race car |
Conversion Formula
The conversion between miles per hour (mph) and kilometers per hour (km/h) is based on the relationship between miles and kilometers:
Since 1 mile = 1.60934 kilometers
Since 1 kilometer = 0.621371 miles
Understanding MPH and KM/H
Miles per hour (mph) is primarily used in the United States, United Kingdom, and a few other countries. It's based on the imperial/US customary system where 1 mile equals 5,280 feet.
Kilometers per hour (km/h) is used by the majority of the world and is part of the metric system. It's the standard unit for speed limits and vehicle speedometers in most countries.
Countries Using MPH
United States, United Kingdom, Myanmar, Liberia, and some Caribbean nations
Frequently Asked Questions
Common questions about mph to km/h conversion
How do you convert mph to km/h?
To convert miles per hour (mph) to kilometers per hour (km/h), multiply the mph value by 1.60934. For example, 60 mph × 1.60934 = 96.56 km/h.
What is 60 mph in km/h?
60 mph equals 96.56 km/h. This is a common highway speed in the United States.
What is 100 km/h in mph?
100 km/h equals 62.14 mph. This is a common speed limit on highways in many countries.
What is 3.1 mph in km/h?
3.1 mph equals approximately 4.99 km/h (about 5 km/h). This is the average human walking speed.
What is 27.8 mph in km/h?
27.8 mph equals approximately 44.74 km/h. This is Usain Bolt's top speed during his 100m world record.
Why do some countries use mph and others use km/h?
The United States, United Kingdom, and a few other countries use miles per hour (mph) based on the imperial system. Most of the world uses kilometers per hour (km/h) based on the metric system, which was adopted internationally for its simplicity and decimal-based calculations.
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