Hertz (Hz)
The hertz (Hz) is the SI unit of frequency: one cycle, oscillation or revolution per second. Mains electricity runs at 50 Hz or 60 Hz.
Symbol: Hz
Quantity: frequency and rotational speed
SI relation: The hertz is the SI unit of frequency, 1 Hz = 1 s⁻¹. Rotational speeds in revolutions per second are numerically equal to hertz.
Derivation: 1 Hz = 1 s⁻¹, one cycle per second.
Exact: yes, by definition
Typical uses
- Mains power (50/60 Hz)
- Sound and music (A4 = 440 Hz)
- Vibration and rotation
- Display refresh rates
Convert hertz to other units
| Conversion | 1 Hz equals | Reverse |
|---|---|---|
| hertz to megahertz | 0.000001 MHz | megahertz to hertz |
| hertz to gigahertz | 1 × 10⁻⁹ GHz | gigahertz to hertz |
| hertz to revolution per minute | 60 rpm | revolution per minute to hertz |
| hertz to kilohertz | 0.001 kHz | kilohertz to hertz |
| hertz to radian per second | 6.283185307 rad/s | radian per second to hertz |
| hertz to revolution per second | 1 rps | revolution per second to hertz |
| hertz to degree per second | 360 °/s | degree per second to hertz |
| hertz to beat per minute | 60 bpm | beat per minute to hertz |
| hertz to terahertz | 1 × 10⁻¹² THz | terahertz to hertz |
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). Hertz (Hz). Retrieved October 25, 2026, from https://scientificconverters.com/units/hertz/
IEEE
Scientific Converters, "Hertz (Hz)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/hertz/