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UnitFormula

Revolution per minute (rpm)

Definition

Revolutions per minute, one sixtieth of a hertz — a rotational-speed unit.

History

Revolutions per minute counts full turns each minute, and became the everyday measure of rotational speed with engines and machinery. One rpm is one sixtieth of a hertz.

Where it is used

rpm is used for engine and motor speed, record-player speeds like 33 and 45, and the spin rate of hard drives.

Typical uses include engine and motor speed, record players, hard drives.

Conversion pages

These pages convert revolution per minute to or from another unit in frequency.

No conversion pages use this unit yet.

Other Frequency units

Sources