Speed Converter
Convert between speed and velocity units
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How to Use Speed Converter
- 1Enter a speed value in the input field.
- 2Select the input unit from the dropdown.
- 3See all conversions update instantly.
- 4Copy any value using the Copy button.
About Speed Converter
Convert between speed units: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots, feet per second (ft/s) and Mach number. Enter a value and see all conversions instantly. Useful for travel, aviation, science and engineering.
Frequently Asked Questions
How do I convert km/h to mph?
Multiply km/h by 0.621371. For example, 100 km/h = 62.14 mph. Conversely, multiply mph by 1.60934 to get km/h.
What is a knot?
A knot is one nautical mile per hour (1.852 km/h or 1.151 mph). It is the standard speed unit in aviation and maritime navigation.
What is Mach number?
Mach 1 is the speed of sound (approximately 343 m/s or 1,235 km/h at sea level and 20°C). Mach 2 is twice the speed of sound. The exact value varies with temperature and altitude.