Frequency Converter
Convert between all frequency units. Select a conversion from the table below.
Hertz
The hertz (Hz) is the SI unit of frequency, equal to one cycle per second. It is used to measure sound waves, electrical signals, clock speeds, and vibrations. Human hearing ranges from 20 Hz to 20,000 Hz.
Kilohertz
The kilohertz (kHz) equals 1,000 hertz. It is used for audio frequencies, AM radio broadcasting, ultrasound equipment, and communication systems.
Megahertz
The megahertz (MHz) equals 1,000,000 hertz. It is used for FM radio, television broadcasting, older computer processors, and wireless communication frequencies.
Gigahertz
The gigahertz (GHz) equals 1,000,000,000 hertz. It measures modern CPU clock speeds, Wi-Fi and 5G frequencies, radar systems, and microwave communication.
Revolutions per minute
Revolutions per minute (rpm) measures rotational speed. It is used for engines, electric motors, hard drives, fans, and industrial machinery. One rpm equals 1/60 hertz.
What Is Frequency?
Frequency is the number of occurrences of a repeating event per unit of time. It measures how often something happens in one second (for hertz) or one minute (for rpm). Frequency is fundamental in electronics, telecommunications, music, and physics.
SI Frequency Units
The hertz (Hz) is the SI unit of frequency, equal to one cycle per second. Human hearing ranges from about 20 Hz to 20,000 Hz. The kilohertz (kHz) is used for audio frequencies and AM radio. The megahertz (MHz) is used for FM radio and older processors. The gigahertz (GHz) measures modern CPU clock speeds and wireless communication bands.
Mechanical Frequency
Revolutions per minute (rpm) measures rotational speed in engines, hard drives, fans, and industrial machinery. A typical car engine idles at 600–1,000 rpm and may reach 6,000–8,000 rpm under full throttle. One rpm equals 1/60 Hz.