Speedometers are used in vehicles to measure speed

Speed Unit Conversion Calculators

To convert a unit of speed to another, metric or imperial, choose a unit to convert from.

What is Speed

Speed is the rate at which an object moves over a distance

Speed is a measurement of how fast an object is moving, or the rate that an object moves over a distance. An object moving at a high speed will cover a lot of distance in a short amount of time, while an object moving at a low speed will cover little distance over a longer amount of time. Thus, speed can be measured as the distance an object travels divided by the time it takes to travel this distance, ie. speed = distance / time. The Physics Classrom has more information on understanding and measuring speed, and how it compares with an object's velocity. Speed over land is commonly measured in miles per hour or kilometers per hour, and speed over sea is commonly measured in knots. The speed of sound is equal to 767.27 miles per hour or 1,235 kilometers per hour.

Units of Speed Measurement

Units of speed include knots, mach, speed of sound, miles per hour, feet per second, kilometers per second, kilometers per hour, meters per second, and centimeters per second.

Common Speed Measurement Conversions

Knots to Miles Per Hour Speed Conversion
1 knot is equal to 1.150779 miles per hour
Miles Per Hour to Kilometers Per Hour Speed Conversion
1 mile per hour is equal to 1.609344 kilometers per hour
Mach to Miles Per Hour Speed Conversion
1 mach is equal to 767.269148 miles per hour
Mach to Kilometers Per Hour Speed Conversion
1 mach is equal to 1,235 kilometers per hour
Speed Of Sound to Miles Per Hour Speed Conversion
1 speed of sound is equal to 767.269148 miles per hour
Meters Per Second to Feet Per Second Speed Conversion
1 meter per second is equal to 3.28084 feet per second

Speed Unit Conversion Table

Equivalent speed metric and imperial measurements
Knot Mach Speed Of Sound Mile Per Hour Foot Per Second Kilometer Per Second Kilometer Per Hour Meter Per Second Centimeter Per Second
1 knot = 1 0.0015 0.0015 1.150779 1.68781 0.000514 1.852 0.514444 51.444444
1 mach = 666.738661 1 1 767.269148 1,125 0.343 1,235 343 34,300
1 speed of sound = 666.738661 1 1 767.269148 1,125 0.343 1,235 343 34,300
1 mile per hour = 0.868976 0.001303 0.001303 1 1.466667 0.000447 1.609344 0.44704 44.704
1 foot per second = 0.592484 0.000889 0.000889 0.681818 1 0.000305 1.09728 0.3048 30.48
1 kilometer per second = 1,944 2.915452 2.915452 2,237 3,281 1 3,600 1,000 100,000
1 kilometer per hour = 0.539957 0.00081 0.00081 0.621371 0.911344 0.000278 1 0.277778 27.777778
1 meter per second = 1.943844 0.002915 0.002915 2.236936 3.28084 0.001 3.6 1 100
1 centimeter per second = 0.019438 0.000029155 0.000029155 0.022369 0.032808 0.000010 0.036 0.01 1