Kilometers per Hour to Miles per Hour Converter
Convert kilometers per hour to miles per hour instantly with a speed calculator built for driving, aviation, marine navigation, physics, sports, and engineering reference.
kph to mph Calculator
Enter a speed value and the conversion updates automatically.
Result updates automatically.
Formula: miles per hour = kilometers per hour × 0.6213711922
How to Convert Kilometers per Hour to Miles per Hour
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 kilometer per hour
0.6213711922 miles per hour
10 kilometers per hour
6.2137119224 miles per hour
100 kilometers per hour
62.1371192237 miles 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.
KPH to MPH 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 kph to mph?
Multiply the kph value by 0.6213711922 to get mph. 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.