Frequency Converter

Frequency is the number of occurrences of a repeating event per unit of time. It is one of the most fundamental quantities in physics, engineering, and communications. The SI unit of frequency is the hertz (Hz), defined as one cycle per second. Frequency determines the pitch of sound, the color of light, the speed of computer processors, the band of radio transmissions, and the rotation speed of mechanical systems. Understanding frequency and being able to convert between its various units is essential for anyone working in electronics, telecommunications, acoustics, music, or mechanical engineering.

Frequency units span an enormous range, from less than one hertz (for slow phenomena like tidal cycles) to hundreds of terahertz (for visible light). The metric prefix system provides convenient units for different scales: kilohertz (kHz, 10³ Hz) for audio and radio, megahertz (MHz, 10⁶ Hz) for FM radio and computer clocks, gigahertz (GHz, 10⁹ Hz) for modern processors and WiFi, and terahertz (THz, 10¹² Hz) for infrared and far-infrared radiation. Beyond the hertz-based units, rotational frequency is commonly expressed in revolutions per minute (RPM) for mechanical systems and revolutions per second (RPS) for scientific contexts.

This converter supports eight frequency units and allows you to convert between any pair of them instantly. It also displays the input value converted into all supported units simultaneously, giving you a comprehensive view of the frequency across different scales and systems. The swap button lets you quickly reverse the conversion direction without retyping values.

All frequency conversions work through the hertz as the common intermediate unit. The conversion first transforms the input value to hertz, then converts from hertz to the target unit.

Use this calculator to convert between any two frequency units:

1. Enter the value: Type the numerical value into the input field. You can enter whole numbers, decimals, or scientific notation for very large or small values.
2. Select the source unit: Choose the unit you are converting from using the "From" dropdown. Options include Hz, kHz, MHz, GHz, THz, RPM, RPS, and rad/s.
3. Select the target unit: Choose the unit you want to convert to using the "To" dropdown.
4. Read the result: The main result card shows the converted value. Below it, you can see the input value expressed in all supported units.
5. Swap units: Click the swap button to reverse the conversion direction instantly.

The common frequencies section provides reference values for FM radio, WiFi, CPU speeds, and other familiar frequency ranges.

The calculator displays your input value converted into all eight supported frequency units:

• Hertz (Hz): The SI unit. One hertz equals one cycle per second. Used as the base for all other frequency units.
• Kilohertz (kHz): 1 kHz = 1,000 Hz. Used for audio frequencies, AM radio, and some communication protocols.
• Megahertz (MHz): 1 MHz = 1,000,000 Hz. Used for FM radio (88-108 MHz), older computer processors, and television broadcasting.
• Gigahertz (GHz): 1 GHz = 1,000,000,000 Hz. Used for modern computer processors (2-5 GHz), WiFi (2.4/5 GHz), and cellular networks.
• Terahertz (THz): 1 THz = 10¹² Hz. Used for far-infrared radiation, 6G research, and advanced spectroscopy.
• Revolutions per minute (RPM): 1 Hz = 60 RPM. Used for engine speed, fan speed, and mechanical rotation.
• Revolutions per second (RPS): 1 Hz = 1 RPS. Used in some scientific and engineering contexts.
• Radians per second (rad/s): 1 Hz = 2π rad/s. Used in physics and signal processing for angular frequency.

The highlighted row in the all-units table indicates your selected target unit for easy reference.

Frequency conversion is essential in telecommunications and radio engineering. Radio stations broadcast at specific frequencies: AM radio stations operate in the kilohertz range (530-1700 kHz), while FM radio stations operate in the megahertz range (88-108 MHz). Cellular networks use frequencies in the hundreds of MHz to several GHz. WiFi operates at 2.4 GHz and 5 GHz bands. Converting between these units helps engineers design, test, and troubleshoot communication systems.

In computing and electronics, processor clock speeds are measured in GHz, memory speeds in MHz, and serial communication baud rates in Hz or bits per second. A 3.5 GHz processor executes 3.5 billion cycles per second, and understanding this frequency in different units helps compare performance across different architectures and generations. Signal integrity analysis requires converting between Hz and rad/s for mathematical modeling.

In mechanical engineering, rotational speeds are expressed in RPM for engines, motors, fans, and turbines. A car engine idling at 800 RPM is rotating at approximately 13.3 Hz. Converting between RPM and Hz is essential for vibration analysis, balancing rotating machinery, and matching motor speeds to driven equipment. In music, frequencies determine pitch: middle C is approximately 261.6 Hz, and the concert A standard is 440 Hz.