Revolutions per minute (abbreviated rpm, RPM, r/min, or r·min−1) is a unit of frequency of rotation: the number of full rotations completed in one minute around a fixed axis. It is used as a measure of rotational speed of a mechanical component.
Standards organizations generally recommend the symbol r/min, which is more consistent with the general use of unit symbols. This is not enforced as an international standard. In French for example, tr/mn (tours par minute) is commonly used, and the German unit reads U/min (Umdrehungen pro Minute) or 1/min (= 1 min-1).
The corresponding unit in the International System of Units (SI) is hertz (symbol Hz) or s-1 (1/second). Revolutions per minute is converted to hertz through division by 60. Conversion from hertz to RPM is by multiplication with 60.
1 rpm = 1/min = 1/(60s) = 1/60 Hertz = 16.667 mHz
Another related unit is the SI unit for angular velocity, radian per second (rad·s−1):
1 RPM = 2π rad·min−1 = 2π/60 rad·s−1 ≈ 0.10471976 rad·s−1
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