Revolutions per minute

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Revolutions per minute
A car's tachometer marked in multiples of a thousand rpm
General information
Unit of	Rotational speed, rotational frequency
Symbol	rpm, r/min
Conversions
1 rpm in ...	... is equal to ...
SI accepted units	1 min−1
SI units	⁠1/60⁠ Hz = 0.016 Hz
SI base units	0.016 s−1

Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min⁻¹) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to ⁠1/60⁠ hertz.