Speed Converter

Multiply the speed in kilometers per hour by 0.621371 to get miles per hour. For example, 100 km/h equals about 62.14 mph. This conversion is commonly needed when reading speed limits or vehicle speedometers between countries that use different units.

Multiply the speed in miles per hour by 0.44704 to get meters per second. For example, 60 mph equals about 26.82 m/s. Meters per second is the SI unit for speed and is commonly used in physics and engineering calculations.

A knot is one nautical mile per hour, equal to about 1.15078 mph or 1.852 km/h. Knots are the standard speed unit used in aviation and maritime navigation because they relate directly to nautical miles and degrees of latitude.

Mach is a ratio comparing an object's speed to the local speed of sound. Mach 1 is approximately 343 m/s (about 767 mph) at sea level and 20°C, though the actual speed of sound varies with air temperature and altitude, so Mach conversions here use the standard sea-level value.

One mile per hour equals approximately 1.46667 feet per second. This conversion is often used in physics problems, sports analytics like pitch or sprint speed, and engineering calculations involving falling or moving objects.

A comprehensive speed converter supports meters per second (the SI unit), kilometers per hour, miles per hour, knots (nautical miles per hour), feet per second, and Mach — covering everyday, aviation, maritime, and scientific use cases.