Frequency Converter
Convert between hertz, kilohertz, megahertz, and gigahertz
Frequency conversions are central to electronics, radio communication, audio engineering, and physics. The hertz (Hz) measures cycles per second and scales dramatically across applications: human hearing spans 20 Hz to 20 kHz, AM radio uses hundreds of kHz, FM radio uses MHz, WiFi operates in GHz, and modern processors run at several GHz. Understanding frequency units helps engineers design circuits, select components, and comply with radio frequency regulations.
Multi-Unit Converter
All conversions for 1 Hz
About Frequency Units
The SI unit of frequency is the hertz (Hz = 1/s). The metric prefix system scales it to kilohertz (kHz, 10³ Hz), megahertz (MHz, 10⁶ Hz), gigahertz (GHz, 10⁹ Hz), and terahertz (THz, 10¹² Hz). Radians per second (rad/s) is the angular frequency unit used in signal processing and mechanical vibrations. RPM (revolutions per minute) measures rotational frequency in machinery.
History of Frequency Measurement
Frequency as a measurable quantity became important with the development of wave theory and electronics. Heinrich Hertz demonstrated electromagnetic waves in 1887, establishing the experimental basis for radio communication. The SI unit of frequency was named in his honor. As technology advanced, frequency units scaled from the audible range (hertz) to radio (kHz to MHz), television and WiFi (MHz to GHz), and modern microprocessors (GHz). Each metric prefix — kilo, mega, giga, tera — represents a factor of 1,000 increase in frequency.
Practical Tips for Frequency Conversions
Human hearing ranges from about 20 Hz to 20 kHz, with sensitivity peaking around 3-4 kHz. AM radio broadcasts in kHz, FM radio in MHz, WiFi and cellular in GHz. Modern CPU clock speeds are in the 3-5 GHz range. Period (seconds) is the reciprocal of frequency (hertz) — a 100 Hz signal has a 10 ms period. For rotating machinery, RPM (revolutions per minute) converts to hertz by dividing by 60.
Common Pitfalls to Avoid
Confusing angular frequency (rad/s) with cyclic frequency (Hz) is common in physics and engineering. Angular frequency ω = 2πf, so a 60 Hz AC signal has ω = 377 rad/s. Mixing up period and frequency — especially when period is expressed in non-SI units like minutes or hours — can lead to errors of factors of 60 or 3600.
Professional Uses
Audio engineers work in hertz for frequency response, equalization, and filter design. Radio frequency engineers use MHz and GHz for antenna design, modulation, and propagation calculations. Computer hardware engineers specify clock frequencies in GHz. Mechanical engineers measure rotating machinery speeds in RPM and hertz for vibration analysis. Musicians use hertz for instrument tuning (A4 = 440 Hz standard).