Speed Converter
Convert km/h, mph, m/s, knots and other speed units
The four common units
km/h means kilometres per hour, mph means statute miles per hour, m/s means metres per second, and kn means nautical miles per hour. One knot is exactly 1.852 km/h.
Use the converter
Enter a numeric value, select source and target units, and convert. The swap button exchanges both units without requiring the value again.
Example: 100 km/h
100 km/h is approximately 62.137 mph, 27.778 m/s, and 53.996 kn. Differences in later digits come from display precision and rounding.
Speed is not acceleration
Speed is distance per time. Acceleration describes how quickly speed changes. This tool converts units but does not calculate distance, time, or acceleration.
Frequently Asked Questions
How do I convert km/h to mph?
Multiply km/h by approximately 0.621371. The converter uses the shared unit factors directly.
How many m/s is 100 km/h?
100 km/h is approximately 27.7778 m/s.
What is a knot?
One knot is one nautical mile per hour, exactly 1.852 km/h.
How do mph and knots differ?
Both are distance per hour, but mph uses statute miles and knots use nautical miles.
How many decimal places should I use?
Choose precision appropriate to the measurement. Extra displayed digits do not make an imprecise source value more accurate.
Can I convert very small or high speeds?
Yes, within normal finite numeric input. Mach depends on physical conditions, so a fixed conversion is only a reference convention.