Speed Converter
Convert between km/h, mph, m/s, ft/s and knots.
How to Use the Speed Converter
Convert between kilometers per hour, miles per hour, meters per second, feet per second and knots.
- Select the "From" unit — choose the speed unit you want to convert from.
- Enter a value — type any number into the input field. The result updates as you type.
- Select the "To" unit — choose the target speed unit.
- Swap if needed — click the swap button to reverse the conversion direction.
- Copy the result — click Copy to send the value to your clipboard.
All conversions are performed in your browser using exact conversion factors.
Frequently Asked Questions
How do I convert km/h to mph?
Divide km/h by 1.60934 to get mph. For example, 100 km/h ÷ 1.60934 = 62.14 mph. A quick rule of thumb: multiply km/h by 0.62 for an approximate mph value.
What is a knot?
A knot is a unit of speed equal to one nautical mile per hour (1.852 km/h or about 1.151 mph). It is used in aviation and marine navigation.
How fast is the speed of sound?
The speed of sound in air at sea level is approximately 343 m/s, 1,235 km/h, or 767 mph (at 20°C / 68°F). It varies with temperature and altitude.
How do I convert m/s to km/h?
Multiply m/s by 3.6 to get km/h. For example, 10 m/s × 3.6 = 36 km/h.
What is the fastest wind speed ever recorded?
The fastest wind speed recorded at ground level is 407 km/h (253 mph) during a tornado in Oklahoma, 1999. The highest gust ever measured was 408 km/h (254 mph) on Barrow Island, Australia, during Tropical Cyclone Olivia in 1996.
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