Frequency Converter

Frequency Unit Converter

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Frequency Unit Conversion Guide

Frequency is the number of occurrences of a repeating event per unit of time. It is fundamental to radio communications, audio engineering, computing, optics, and mechanical systems. Our free frequency converter supports seven major units spanning everyday audio to terahertz radiation.

Hertz and Its Multiples

The hertz (Hz) is the SI unit of frequency, defined as one cycle per second. It is named after German physicist Heinrich Hertz, who first demonstrated radio wave transmission. The scale of hertz spans an enormous range:

  • Hertz (Hz): Human hearing range 20 Hz – 20,000 Hz (20 kHz)
  • Kilohertz (kHz): AM radio broadcasts (530–1,700 kHz); audio frequencies
  • Megahertz (MHz): FM radio (87.5–108 MHz); WiFi 2.4 GHz band starts here
  • Gigahertz (GHz): CPU clock speeds (2–5 GHz); WiFi 5 GHz band; mobile networks (3G, 4G, 5G)
  • Terahertz (THz): Infrared and visible light frequencies; terahertz imaging used in security scanning

RPM — Rotational Frequency

Revolutions per minute (RPM) measures rotational frequency in engines, motors, hard drives, and fans. A car engine typically idles at 700–900 RPM and revs to 5,000–7,000 RPM. A hard disk drive (HDD) spins at 5,400 or 7,200 RPM. One RPM equals 1/60 Hz — our converter handles this automatically.

Radians per Second — Angular Frequency

Angular frequency (ω) in radians per second is used in physics, signal processing, and electrical engineering for sinusoidal waveforms. The relationship is ω = 2πf, where f is the frequency in Hz. Therefore 1 Hz = 2π rad/s ≈ 6.2832 rad/s. This conversion appears in oscillator circuits, pendulum calculations, and AC circuit analysis.

Frequency in Computing

Modern processors operate at gigahertz clock speeds. A 3.5 GHz processor executes 3,500,000,000 clock cycles per second. Memory, bus, and GPU frequencies are also measured in MHz and GHz. The higher the clock frequency, the more operations per second (though performance also depends on architecture).

Frequently Asked Questions

What is the human hearing frequency range?
The average human can hear frequencies from about 20 Hz (very low bass) to 20,000 Hz (20 kHz, very high treble). This range narrows with age, particularly at higher frequencies. Ultrasound used in medical imaging operates above 20 kHz, beyond the range of human hearing.
How do I convert RPM to Hz?
Divide RPM by 60 to get Hz. For example, 3,600 RPM ÷ 60 = 60 Hz. This is why electrical power grid frequency in the US (60 Hz) corresponds to 3,600 RPM — AC generators and synchronous motors run at this speed on the 60 Hz grid.
What frequency is 5G mobile technology?
5G networks operate across a range of frequency bands. Sub-6 GHz 5G (most common) uses 600 MHz to 6 GHz. mmWave 5G uses 24–100 GHz for ultra-fast speeds over short distances. Higher frequencies carry more data but have shorter range and less penetration through walls.
What is a terahertz wave?
Terahertz (THz) waves occupy the spectrum between microwaves and infrared light (0.1–10 THz). They can pass through clothing, paper, and plastics but are blocked by metals and water, making them useful for non-invasive security scanning, medical imaging, and quality control in manufacturing.
What is the relationship between frequency and wavelength?
Frequency and wavelength are inversely proportional: wavelength = speed of light ÷ frequency (λ = c/f). A 100 MHz FM radio wave has a wavelength of about 3 meters. A 3 GHz microwave has a wavelength of 10 cm. Visible light (430–750 THz) has wavelengths of 400–700 nanometers.