Revolutions per minute
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.
| 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 |
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