Speed conversion
How to convert speed
Speed combines distance and time. A correct conversion changes both parts of the unit or uses a direct factor that already includes them.
Open the speed converterConvert km/h and m/s
m/s = km/h รท 3.6
The factor comes from 1 km = 1,000 m and 1 h = 3,600 s. A speed of 90 km/h is 25 m/s. Multiply m/s by 3.6 to go back.
Convert mph and km/h
One international mile equals 1.609344 km, so multiply mph by 1.609344. For example, 60 mph equals 96.56064 km/h. Divide km/h by 1.609344 for mph.
Knots and feet per second
One knot is one nautical mile per hour, and the international nautical mile is exactly 1,852 meters. Thus 20 knots equals 37.04 km/h. Feet per second can be converted using the exact international foot of 0.3048 m.
Check the time unit
Do not convert only the distance portion. Meters per minute and meters per second differ by a factor of 60 even though both use meters. For average speed, divide total distance by total elapsed time rather than averaging separate speed readings without appropriate weighting.
Convert with ToolPixels
The free Speed Converter converts the supported units in your browser. Enter a value, choose the source and target units, select the needed precision, and review the displayed formula before using the result.