Frequency Converter

Convert between hertz, kilohertz, megahertz, gigahertz, terahertz, and RPM instantly.

Value

From

Common Frequency Conversions

From	To	Result
1 MHz	Hz	1,000,000 Hz
1 GHz	MHz	1,000 MHz
1 kHz	Hz	1,000 Hz
3,000 MHz	GHz	3 GHz
1 THz	GHz	1,000 GHz
60 RPM	Hz	1 Hz
3,600 RPM	Hz	60 Hz
1 Hz	RPM	60 RPM

Frequently Asked Questions

The hertz (Hz) is the SI unit of frequency, defined as one cycle per second. Named after physicist Heinrich Hertz, it measures how many times a periodic event repeats per second. Common examples: AC power grids run at 50 or 60 Hz; CPU clocks at GHz; sound waves at Hz–kHz; radio waves at MHz–GHz.

Divide RPM by 60 to get Hz. 1 RPM = 1/60 Hz ≈ 0.01667 Hz. For example, a motor spinning at 3,000 RPM operates at 50 Hz (3000/60 = 50). This is why 50 Hz mains power corresponds to motors typically spinning at 3,000 or 1,500 RPM depending on the number of poles.

One terahertz (THz) = 10¹² Hz = 1 trillion cycles per second. THz radiation lies between microwave and infrared on the electromagnetic spectrum. It is used in security scanners, medical imaging, and material analysis. Visible light frequencies are hundreds of terahertz (400–790 THz).

WiFi uses 2.4 GHz and 5 GHz bands. The newer WiFi 6E also uses the 6 GHz band. Bluetooth operates at 2.4 GHz. 4G LTE uses 700 MHz – 2.6 GHz, and 5G uses sub-6 GHz bands as well as mmWave bands up to 86 GHz for very high data rates in dense areas.

These are metric prefixes for hertz: 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz, 1 GHz = 1,000,000,000 Hz. Audio frequencies range from 20 Hz to 20 kHz. AM radio uses kHz. FM radio and TV use MHz. WiFi, CPU clocks, and 5G use GHz. Each step up is 1,000× larger.

Humans typically hear from 20 Hz to 20,000 Hz (20 kHz). This range narrows with age — adults over 50 often cannot hear above 12–14 kHz. Below 20 Hz is infrasound (felt rather than heard). Above 20 kHz is ultrasound, used in medical imaging and sonar. Dogs hear up to ~65 kHz; bats up to ~200 kHz.

Radio waves span a huge range: AM radio: 530–1,700 kHz; FM radio: 87.5–108 MHz; VHF TV: 54–216 MHz; UHF TV: 470–890 MHz; 4G LTE: 700 MHz–2.6 GHz; 5G mmWave: 24–86 GHz. Longer wavelengths (lower frequency) travel farther; shorter wavelengths (higher frequency) carry more data but have less range.

CPU clock speed in GHz measures how many billions of clock cycles per second the processor performs. A 3.5 GHz CPU executes 3.5 billion cycles per second. However, performance also depends on how many operations are done per cycle (IPC). Modern CPUs at 3–5 GHz with high IPC far outperform older 4 GHz processors with lower IPC.

Europe, Africa, Asia, and Australia use 50 Hz electricity; the US, Canada, and most of the Americas use 60 Hz. This split arose from historical competition between manufacturers in the 1890s — Westinghouse standardized 60 Hz in the US while European manufacturers settled on 50 Hz. The difference matters for motors and some clocks but not for most modern electronics.

Wavelength and frequency are inversely related: wavelength = speed / frequency (λ = v/f). For electromagnetic waves (radio, light): λ = c/f where c = 299,792,458 m/s. A 100 MHz FM radio signal has a wavelength of ~3 meters; visible light at 600 THz has a wavelength of ~500 nanometers. Higher frequency = shorter wavelength.

About This Frequency Converter

This free frequency converter converts between hertz, kilohertz, megahertz, gigahertz, and terahertz. Enter a frequency in any unit and the remaining units update instantly.

When to use this converter

Converting radio and wireless signal frequencies
Working with CPU and memory clock speeds
Signal processing and electronics calculations

Standards & References

NIST — SI Units (hertz)

How It Works

Enter Frequency

Type any frequency value. The hertz (Hz) is used as the SI base unit for all calculations.

Select Units

Choose from Hz to THz (SI decimal prefixes) plus RPM for rotational applications. Swap direction instantly.

Get Result

Conversion is immediate with the exact factor shown. Use the reference table for common frequency equivalents.

Common Use Cases

Computing & Electronics

Convert CPU clock speeds between MHz and GHz, and understand oscillator frequencies for microcontroller and circuit design projects.

Radio & Wireless

Convert radio frequencies between kHz, MHz, and GHz for understanding AM/FM bands, WiFi channels, and cellular frequency allocations.

Audio & Acoustics

Convert audio frequencies in Hz and kHz for speaker design, equalizer settings, and understanding the human hearing range (20 Hz – 20 kHz).

Motors & Machinery

Convert between Hz and RPM for motor speed calculations, VFD drive settings, and mechanical equipment operating frequency specifications.

Medical Imaging

Convert ultrasound frequencies between MHz and GHz for medical device specifications, and understand terahertz imaging applications.

Physics Education

Convert between frequency, period, and angular frequency for wave mechanics, electromagnetic spectrum, and oscillation problems.

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