Kilometer per hour to Mile per hour Conversion Calculator: Free Online Tool
Convert kilometers per hour to miles per hour with our free online speed converter.
Kilometer per hour to Mile per hour Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Kilometer per hour).
- The converted value in Mile 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 Kilometer per hour to Mile per hour
Converting Kilometer per hour to Mile per hour involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Kilometer per hour = 0.621371 miles per hourExample Calculation:
Convert 60 kilometers per hour: 60 × 0.621371 = 37.28227 miles 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 Kilometer per hour and a Mile per hour?
Kilometers per hour (km/h or kph) is a unit of speed expressing the number of kilometers traveled in one 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.
Note: The Kilometer per hour is part of the metric (SI) system, primarily used globally in science and trade. The Mile per hour belongs to the imperial/US customary system.
History of the Kilometer per hour and Mile per hour
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.
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.
Common Uses for kilometers per hour and miles per hour
Explore the typical applications for both Kilometer per hour (metric) and Mile per hour (imperial/US) to understand their common contexts.
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.
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.
Frequently Asked Questions
Questions 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.
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.
Conversion Table: Kilometer per hour to Mile per hour
| Kilometer per hour (km/h) | Mile per hour (mph) |
|---|---|
| 1 | 0.621 |
| 5 | 3.107 |
| 10 | 6.214 |
| 25 | 15.534 |
| 50 | 31.069 |
| 100 | 62.137 |
| 500 | 310.686 |
| 1,000 | 621.371 |
All Speed Conversions
Conversion Formula
1 km/h = 0.621371 mph
Where 1 Kilometer per hour (km/h) equals the calculated value in miles per hour (mph).