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# Revolutions per minute

Revolution per minute
Unit ofRotational speed
Symbolrpm or r/min
Conversions
1 rpm in ...... is equal to ...
SI frequency   1/60 Hz ≈ 0.01666667 Hz
SI derived rotational frequency   ${\displaystyle 60}$ ${\displaystyle s^{-1},}$ ${\displaystyle 60/s}$
SI derived rotational speed   ${\displaystyle 1}$ ${\displaystyle {min}^{-1},}$ ${\displaystyle 1/min}$

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.

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• ✪ What is an RPM?
• ✪ Angular & Linear Speed of a Circle / Wheel Given RPM and Radius Trig & Precalculus
• ✪ Linear Speed and Angular Velocity

## 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 ω or Ω 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.