Units of measurement
From value
To value
Calculations
Mile per hour (mph)
Speed of light (c)
0
0123456789
Information
Mile per hour (mph)
Mile per hour (mph) is a unit of speed equal to one mile traveled per hour. It is used in the United States and the United Kingdom to measure vehicle and aircraft speeds.
Speed of light (c)
Speed of light (c) is a fundamental physical constant equal to 299,792,458 m/s. It is the maximum speed at which information or matter can travel.