RPM
Revolutions per minute (rpm) count full turns of a rotating shaft each minute. Dividing by 60 gives revolutions per second, numerically equal to hertz.
Symbol: rpm
Quantity: frequency and rotational speed
SI relation: 1 rpm = 0.01666666666667 Hz (exact)
Derivation: 1 rpm = 1/60 revolution per second = 1/60 Hz.
Exact: yes, by definition
Typical uses
- Engine and motor speeds
- Hard drives (5400, 7200 rpm)
- Fans, pumps and machine tools
- Turntables (33⅓, 45 rpm)
Convert revolutions per minute to other units
| Conversion | 1 rpm equals | Reverse |
|---|---|---|
| revolution per minute to hertz | 0.01666666667 Hz | hertz to revolution per minute |
| revolution per minute to megahertz | 1.666666667 × 10⁻⁸ MHz | megahertz to revolution per minute |
| revolution per minute to gigahertz | 1.666666667 × 10⁻¹¹ GHz | gigahertz to revolution per minute |
| revolution per minute to kilohertz | 0.00001666666667 kHz | kilohertz to revolution per minute |
| revolution per minute to radian per second | 0.1047197551 rad/s | radian per second to revolution per minute |
| revolution per minute to revolution per second | 0.01666666667 rps | revolution per second to revolution per minute |
| revolution per minute to degree per second | 6 °/s | degree per second to revolution per minute |
| revolution per minute to beat per minute | 1 bpm | beat per minute to revolution per minute |
| revolution per minute to terahertz | 1.666666667 × 10⁻¹⁴ THz | terahertz to revolution per minute |
Open the Frequency & RPM Converter to convert any value between all units.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7 (SI prefixes); hertz, Table 4.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). RPM. Retrieved October 25, 2026, from https://scientificconverters.com/units/revolution-per-minute/
IEEE
Scientific Converters, "RPM," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/revolution-per-minute/