Conversion method
Hertz counts cycles per second. 60 rpm is 1 revolution per second, equal to 1 Hz for a repeating event once per revolution. Angular frequency is 2π times frequency, so radians per second are not numerically identical to hertz.
rpm = x × 60
10 Hz = 600 rpm.
| Hz | rpm |
|---|---|
| 1 | 60 |
| 5 | 300 |
| 10 | 600 |
| 25 | 1500 |
| 50 | 3000 |
| 100 | 6000 |
Unit definitions and sources
Angular frequency in rad/s uses 2π radians per cycle. RPM assumes one cycle per revolution.
13 of the 19 definitions below were checked against the cited sources on 2026-09-20 (AI-assisted check).
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Hertz (Hz); si | Common units | Hertz measures frequency. hz = (value in Hz) × 1. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Kilohertz (kHz); si | Common units | Kilohertz measures frequency. hz = (value in kHz) × 1000. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Megahertz (MHz); si | Common units | Megahertz measures frequency. hz = (value in MHz) × 1000000. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Gigahertz (GHz); si | Common units | Gigahertz measures frequency. hz = (value in GHz) × 1000000000. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Revolution per minute (rpm); other | Common units | Revolution per minute measures frequency. hz = (value in rpm) × 0.016666666666666666. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Radian per second (rad/s); si | Common units | Radian per second measures frequency. hz = (value in rad/s) × 0.15915494309189535. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Exahertz (EHz); si | Specialist units | exahertz: E denotes 10^18; the unit gives 1000000000000000000 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Petahertz (PHz); si | Specialist units | petahertz: P denotes 10^15; the unit gives 1000000000000000 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Terahertz (THz); si | Specialist units | terahertz: T denotes 10^12; the unit gives 1000000000000 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Hectohertz (hHz); si | Specialist units | hectohertz: h denotes 10^2; the unit gives 100 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Decahertz (daHz); si | Specialist units | decahertz: da denotes 10^1; the unit gives 10 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Decihertz (dHz); si | Specialist units | decihertz: d denotes 10^-1; the unit gives 0.1 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Centihertz (cHz); si | Specialist units | centihertz: c denotes 10^-2; the unit gives 0.01 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Millihertz (mHz); si | Specialist units | millihertz: m denotes 10^-3; the unit gives 0.001 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Microhertz (µHz); si | Specialist units | microhertz: µ denotes 10^-6; the unit gives 0.000001 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Nanohertz (nHz); si | Specialist units | nanohertz: n denotes 10^-9; the unit gives 1e-9 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Picohertz (pHz); si | Specialist units | picohertz: p denotes 10^-12; the unit gives 1e-12 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Femtohertz (fHz); si | Specialist units | femtohertz: f denotes 10^-15; the unit gives 1e-15 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
| Attohertz (aHz); si | Specialist units | attohertz: a denotes 10^-18; the unit gives 1e-18 hz. Common use: Cycles and rotational rates. | Exact definition; numerical display may be rounded |
Sources: BIPM: International System of Units; NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of frequency conversions
All 19 frequency units convert through Hertz (Hz). 19 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.