Speed Converter
Convert speed between mph, kph, meters per second, knots, feet per second, and Mach with one fast online calculator.
Speed Calculator
Enter a speed value and the conversion updates automatically.
Result updates automatically.
Formula: kilometers per hour = miles per hour × 1.609344
How Speed Conversion Works
Speed conversion uses meters per second as the reference unit. Multiply the source speed by the factor shown below to convert it into the selected output unit. Mach is based on Mach 1 = 340.29 m/s, a common sea-level reference.
1 mile per hour
1.609344 kilometers per hour
10 miles per hour
16.09344 kilometers per hour
100 miles per hour
160.9344 kilometers per hour
Speed Formula Notes
The calculator converts through meters per second as the SI speed unit, then formats the result for the selected speed unit.
Speed Converter FAQ
Which speed units are supported?
This tool supports mph, kph, meters per second, knots, feet per second, and Mach.
How do I convert mph to kph?
Multiply the mph value by 1.609344 to get kph. The calculator performs the formula automatically.
Can I reverse the speed conversion?
Yes. Use the swap button to reverse the selected units and calculate the opposite direction.