Speed Converter●
Road speeds, wind and moving things. Convert metric, imperial and nautical speeds.
Speed
Use a decimal point, for example 2.54. Scientific notation works too: 1e3.
Common conversions
Pick an example to startAll equivalent units
The same value, in every supported unit.
Distance per time, in any unit.
Knots use nautical miles per hour. Running pace, such as minutes per kilometre, is a reciprocal measurement and needs a different calculation.
- 1 m/s
- 3.6 km/h
- 1 mph
- 1.609344 km/h
- 1 kn
- 1.852 km/h
Calculation details & precision
Speed conversions use metres per second as the base unit. One km/h is 1/3.6 m/s. One mph is exactly 0.44704 m/s. One knot is one international nautical mile per hour: 1,852 metres in 3,600 seconds.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
How do I convert km/h to mph?
Divide km/h by 1.609344 to get mph. For example, 100 km/h is approximately 62.1371192237 mph.
What is a knot?
One knot is one international nautical mile per hour, exactly 1.852 km/h. Knots are commonly used for marine, aviation and wind speeds.
Is pace the same as speed?
Speed is distance divided by time, such as km/h. Pace is time divided by distance, such as min/km. Pace needs a reciprocal calculation and is not included in this converter.