Speed Converter
Convert units of speed
Features
Supports 10 speed units
Broadly convert from km/h to Mach and the speed of light
Convert all units at once from one input
Show the results in other units simultaneously from a single value
Copy with one click
Get each conversion result with one click
Freely choose the base unit
Switch the base of the input value with the dropdown
How to Use
Enter the value to convert
Enter the speed value you want to convert in the "Value" field
Choose the base unit
Choose the unit of the input value from the "Base unit" dropdown
Check and copy the conversion results
The conversion results to other units are listed and each value can be copied
Use Cases
Comparing vehicle speeds
Convert the speed of bullet trains and aircraft into familiar units to grasp them
Physics calculations and learning
Use the conversion between m/s and km/h for checking and verifying speed problems
Reinterpreting overseas speed notations
Convert mph or knot notation into units familiar in Japan
Converting sports records
Compare and share pitch or running speed values in different units
Basic Knowledge
Formula for Converting Speed from km/h to m/s
To convert speed from km/h to m/s, divide by 3.6. This is because 1 hour equals 3,600 seconds and 1 km equals 1,000 m. For example, 36 km/h equals exactly 10 m/s. To convert from m/s to km/h, multiply by 3.6.
What Are Knots and Mach?
- Knots：A knot is the speed at which an object travels one nautical mile (1,852 m) in one hour. It is used to measure the speed of ships and aircraft, and 1 knot equals approximately 0.514 m/s.
- Mach：Mach is a measurement of speed relative to the speed of sound, where Mach 1 represents the speed of sound. At approximately 20 degrees Celsius, the speed of sound is approximately 340 m/s (or about 1,235 km/h).
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
the speed conversion is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
the conversion results and input suggestions are not stored on the server.
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