Speed Converter
Convert between meters per second, kilometers per hour, miles per hour, knots, feet per second, and Mach number instantly.
How to Use
- Enter the speed value you want to convert in the input field.
- Select the unit you are converting from using the dropdown menu.
- View the converted values across all supported units instantly in the results grid below.
- Change the value or unit at any time and the results will update automatically.
Frequently Asked Questions
What is the difference between km/h and mph?
Kilometers per hour (km/h) is the metric unit of speed used in most countries, while miles per hour (mph) is used primarily in the United States and the United Kingdom. One mile equals approximately 1.60934 kilometers, so 1 mph equals about 1.609 km/h.
What is Mach speed?
Mach is a ratio of the speed of an object to the speed of sound in the surrounding medium. Mach 1 equals the speed of sound, approximately 343 m/s (1,235 km/h or 767 mph) at sea level and 20 degrees Celsius. Mach 2 is twice the speed of sound.
What are knots used for?
Knots are the standard unit of speed in aviation and maritime navigation. One knot equals one nautical mile per hour, which is approximately 1.852 km/h or 1.151 mph. Nautical miles are based on the Earth's circumference, making knots practical for navigation.
How accurate are these conversions?
The conversions are mathematically precise using standard conversion factors. The Mach conversion assumes standard atmospheric conditions at sea level (speed of sound at approximately 343 m/s). Actual Mach numbers can vary with altitude and temperature.