Speed Converter
Convert speed measurements quickly and accurately between common metric, imperial, and nautical units.
Convert km/h, mph, m/s, knots, ft/s, and other speed units in seconds.
Convert Speed
Enter a speed and select the unit you want to convert from.
Speed Conversion Results
Speed Conversion Summary
Input Speed
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km/h
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mph
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m/s
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What Is a Speed Converter?
A speed converter changes a measurement from one speed unit into another equivalent unit. Speed is commonly expressed in kilometers per hour, miles per hour, meters per second, feet per second, or knots depending on the country and application.
This converter provides a quick way to compare speed measurements without manually calculating the conversion between different units.
Speed Units Supported
| Unit | Symbol | Common Use |
|---|---|---|
| Meters per Second | m/s | Scientific and engineering measurements. |
| Kilometers per Hour | km/h | Road speeds and everyday measurements in many countries. |
| Miles per Hour | mph | Road speeds in countries using miles. |
| Feet per Second | ft/s | Engineering, physics, and technical measurements. |
| Knots | kn | Aviation and marine navigation. |
| Meters per Minute | m/min | Industrial and technical applications. |
| Kilometers per Minute | km/min | Higher-speed mathematical and technical calculations. |
How Speed Conversion Works
The calculator first converts the entered speed into meters per second. It then uses that common base unit to calculate the equivalent value in every supported speed unit.
Example: 100 km/h is approximately 62.137 mph and 27.778 m/s.
Common Speed Conversions
| Conversion | Equivalent |
|---|---|
| 1 km/h | 0.621371 mph |
| 1 mph | 1.609344 km/h |
| 1 m/s | 3.6 km/h |
| 1 knot | 1.852 km/h |
| 1 ft/s | 0.3048 m/s |
Frequently Asked Questions
How do I convert km/h to mph?
Multiply the speed in kilometers per hour by approximately 0.621371 to convert it to miles per hour.
How do I convert mph to km/h?
Multiply the speed in miles per hour by 1.609344 to convert it to kilometers per hour.
How fast is 100 km/h in mph?
100 km/h is approximately 62.137 mph.
What is a knot?
A knot is a unit of speed commonly used in aviation and marine navigation. One knot equals exactly 1.852 kilometers per hour.