Revolutions Per Minute
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Revolutions Per Minute
Revolution per minute
Unit ofRotational speed
Symbolrpm or r/min 
SI angular speed rad/s ? 0.1047198 rad/s
SI frequency Hz ? 0.01666667 Hz
SI derived rotational frequency s-1, /s
SI derived rotational speed1 min-1, 1/min

Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min-1) is the number of turns in one minute. It is a unit of rotational speed or the frequency of rotation around a fixed axis.

International System of Units

According to the International System of Units (SI), rpm is not a unit. This is because the word revolution is a semantic annotation rather than a unit. The annotation is instead done as a subscript of the formula sign if needed. Because of the measured physical quantity, the formula sign has to be f for (rotational) frequency and ? or ? for angular velocity. The corresponding basic SI derived unit is s-1 or Hz. When measuring angular speed, the unit radians per second is used.

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