Mile per hour to Kilometer per hour Conversion Calculator: Free Online Tool
Convert miles per hour to kilometers per hour with our free online speed converter.
Mile per hour to Kilometer per hour Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Mile per hour).
- The converted value in Kilometer per hour will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Speed category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Mile per hour to Kilometer per hour
Converting Mile per hour to Kilometer per hour involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Mile per hour = 1.609344 kilometers per hourExample Calculation:
Convert 60 miles per hour: 60 × 1.609344 = 96.56064 kilometers per hour
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Mile per hour and a Kilometer per hour?
Miles per hour (mph, MPH, or mi/h) is an imperial and US customary unit of speed expressing the number of statute miles traveled in one hour.
Kilometers per hour (km/h or kph) is a unit of speed expressing the number of kilometers traveled in one hour.
Note: The Mile per hour is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Kilometer per hour belongs to the metric (SI) system.
History of the Mile per hour and Kilometer per hour
Miles per hour became prominent with the rise of automotive transportation in countries using the imperial system, particularly the United Kingdom and the United States. It provided a practical measure for road travel speeds and regulations.
Kilometers per hour became a common unit of speed with the widespread adoption of the metric system for distance (kilometer) and the standard use of hours for time measurement, particularly following the advent of automobiles and trains where measuring such speeds became practical and necessary.
Common Uses for miles per hour and kilometers per hour
Explore the typical applications for both Mile per hour (imperial/US) and Kilometer per hour (metric) to understand their common contexts.
Common Uses for miles per hour
- Road Traffic (US/UK): The standard unit for speed limits and vehicle speeds (speedometers) in the United States, United Kingdom, and a few other countries.
- Rail Transport (US/UK): Often used for train speeds in these same countries.
- Meteorology (Informal): Sometimes used informally in the US/UK for wind speed in public weather reports, though knots or m/s are preferred in official meteorological contexts.
- Sports: Used in some sports like baseball (pitch speed) and sometimes informally in running or cycling in relevant countries.
Common Uses for kilometers per hour
- Road Traffic: The most common unit for speed limits and vehicle speeds (speedometers) worldwide, except in countries like the US and UK.
- Meteorology: Often used in public weather forecasts to report wind speeds, especially in metric countries.
- Navigation: Used alongside other units like knots in some aviation and maritime contexts, although less common than knots for primary navigation.
- Sports: Sometimes used to describe speeds in cycling, skiing, or running over longer distances.
Frequently Asked Questions
Questions About Mile per hour (mph)
Which countries use mph for speed limits?
Miles per hour is primarily used for road speed limits in the United States, the United Kingdom, and some Caribbean nations.
Is mph an SI unit?
No, mph is part of the imperial and US customary systems. The SI unit for speed is meters per second (m/s).
How do you convert mph to km/h?
Multiply the speed in mph by 1.60934. So, 60 mph is approximately 96.6 km/h.
How do you convert mph to ft/s?
Multiply the speed in mph by 1.46667. So, 60 mph is approximately 88 ft/s.
About Kilometer per hour (km/h)
Where is km/h primarily used?
Kilometers per hour is the standard unit for road speed in most countries around the world that use the metric system.
Is km/h an SI unit?
While it uses SI units (kilometer and hour derived from second), the official SI unit for speed is meters per second (m/s). However, km/h is accepted for use with SI.
How do you convert km/h to mph?
To approximate, divide the speed in km/h by 1.609. So, 100 km/h is roughly 62 mph. (1 km/h ≈ 0.621371 mph).
How do you convert km/h to m/s?
Divide the speed in km/h by 3.6. So, 100 km/h is approximately 27.78 m/s.
Conversion Table: Mile per hour to Kilometer per hour
| Mile per hour (mph) | Kilometer per hour (km/h) |
|---|---|
| 1 | 1.609 |
| 5 | 8.047 |
| 10 | 16.093 |
| 25 | 40.234 |
| 50 | 80.467 |
| 100 | 160.934 |
| 500 | 804.672 |
| 1,000 | 1,609.344 |
All Speed Conversions
Conversion Formula
1 mph = 1.609344 km/h
Where 1 Mile per hour (mph) equals the calculated value in kilometers per hour (km/h).