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Revolutions per minute

For the Rise Against album, see Revolutions Per Minute (album).

The revolution per minute (abbreviated rpm, RPM or r/min) is a unit of frequency, commonly used to measure rotational speed. Examples:

Standards bodies generally recommend the symbol r/min, which better follows the general principles for forming unit symbols.

The SI unit of frequency is the hertz (Hz):

1 rpm = 1 r/min = 1/60 Hz

The SI unit of angular speed is the radian per second:

1 rpm = 1 r/min = 2π rad/min = 2π/60 rad/s = 0.10471976 rad/s
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