Frequency Converter

Amaze SEO Tools provides a free online Frequency Converter that accepts a numeric value in one frequency unit and calculates the equivalent in eight other units simultaneously, with no software installation or account required.

Frequency describes how often a repeating event occurs within a given time period — typically measured in cycles per second (hertz). It is one of the most widely referenced physical quantities in modern technology and science, governing everything from the radio stations you tune into and the processor speed of your computer to the vibration of musical instruments and the rotation speed of machinery. Different fields and applications express frequency using different scales and units, making conversion between them a routine but essential task.

Our converter supports nine units covering the standard hertz family (mHz through THz), rotational speed (rpm), and angular velocity (deg/s and rad/s). Enter a value, select its unit, click Convert, and see every equivalent displayed at once.

Input Fields

Value

The first field is labelled "Value" where you enter the numeric frequency measurement you want to convert. Type any positive number — for example, 2400 for 2,400 MHz, 3600 for 3,600 rpm, or 0.5 for 0.5 Hz. The tool accepts whole numbers and decimals.

Convert From Millihertz to Others

A dropdown menu labelled "Convert From Millihertz to Others" lets you select which unit your input value is expressed in. The dropdown defaults to Millihertz (mHz) and contains nine frequency units:

• Millihertz (mHz) — One thousandth of a hertz. Measures extremely slow oscillations such as tidal rhythms, geological vibrations, and certain biological cycles.
• Hertz (Hz) — The SI base unit of frequency, equal to one cycle per second. The foundational reference point for all frequency measurements.
• Kilohertz (kHz) — One thousand hertz. Common for audio frequencies, AM radio broadcasting, and ultrasonic applications.
• Megahertz (MHz) — One million hertz. Used for FM radio stations, television signals, older computer processor speeds, and wireless communication bands.
• Gigahertz (GHz) — One billion hertz. The standard scale for modern CPU clock speeds, Wi-Fi frequencies, microwave ovens, and satellite communications.
• Terahertz (THz) — One trillion hertz. Found in advanced imaging technology, spectroscopy research, and next-generation wireless communication studies.
• Rotation per minute (rpm) — Measures how many complete rotations an object makes in one minute. Standard for engine speeds, hard drive platters, turntable speeds, and industrial motor ratings.
• Degree per second (deg/s) — Measures angular velocity as degrees of rotation completed each second. Used in gyroscope readings, robotics, drone stabilisation, and navigation systems.
• Radian per second (rad/s) — The SI unit of angular velocity. One full rotation equals 2π radians. Used extensively in physics, mechanical engineering, and control systems mathematics.

reCAPTCHA (I'm not a robot)

Below the dropdown, tick the "I'm not a robot" checkbox to pass the security verification before converting.

Action Buttons

Three buttons appear beneath the reCAPTCHA:

Convert (Blue Button)

The primary action. After entering your value and selecting the source unit, click "Convert" to calculate the equivalent in all other supported frequency units. Results appear on screen instantly.

Sample (Green Button)

Loads an example value and unit selection into the fields so you can preview how the conversion output looks before entering your own data.

Reset (Red Button)

Clears the value field, resets the dropdown to Millihertz, and removes any converted results — returning the tool to its original state.

How to Use Frequency Converter – Step by Step

1. Open the Frequency Converter on the Amaze SEO Tools website.
2. Enter your frequency value in the Value field.
3. Select the source unit from the dropdown — the unit your input is currently expressed in.
4. Tick the reCAPTCHA checkbox to verify yourself.
5. Click "Convert" to generate all equivalent values.
6. Read or copy the results showing your frequency in all nine units.

Key Conversion Factors

The hertz family follows a straightforward decimal scaling pattern, while rotational and angular units involve specific mathematical relationships:

Hertz Family (Decimal Scaling)

• 1 mHz = 0.001 Hz = 0.000001 kHz = 0.000000001 MHz = 0.000000000001 GHz = 0.000000000000001 THz
• 1 Hz = 1,000 mHz = 0.001 kHz = 0.000001 MHz = 0.000000001 GHz
• 1 kHz = 1,000 Hz = 1,000,000 mHz
• 1 MHz = 1,000 kHz = 1,000,000 Hz
• 1 GHz = 1,000 MHz = 1,000,000 kHz = 1,000,000,000 Hz
• 1 THz = 1,000 GHz = 1,000,000 MHz = 1,000,000,000,000 Hz

Rotational and Angular Conversions

• 1 Hz = 60 rpm (one cycle per second = 60 cycles per minute)
• 1 Hz = 360 deg/s (one full rotation per second = 360 degrees per second)
• 1 Hz = 2π rad/s ≈ 6.28318 rad/s (one full rotation = 2π radians)
• 1 rpm = 1/60 Hz ≈ 0.01667 Hz = 6 deg/s = π/30 rad/s ≈ 0.10472 rad/s
• 1 deg/s = 1/360 Hz ≈ 0.002778 Hz = 1/6 rpm ≈ 0.16667 rpm = π/180 rad/s ≈ 0.01745 rad/s
• 1 rad/s = 1/(2π) Hz ≈ 0.15915 Hz = 30/π rpm ≈ 9.5493 rpm = 180/π deg/s ≈ 57.2958 deg/s

All Nine Units Explained in Depth

Millihertz (mHz)

One thousandth of a hertz — meaning the event repeats once every 1,000 seconds (roughly 16.7 minutes). Millihertz frequencies appear in seismology (very-low-frequency earth vibrations), oceanography (wave period measurements), and chronobiology (circadian rhythm oscillations). Climate scientists studying periodic atmospheric patterns also encounter millihertz-range cycles.

Hertz (Hz)

The SI base unit of frequency, defined as one cycle per second. Named after physicist Heinrich Hertz, it serves as the anchor for the entire frequency scale. Everyday examples include the 50 Hz or 60 Hz frequency of your household electrical supply, the 440 Hz concert pitch of the note A above middle C, and human heartbeat rates typically between 1 and 2 Hz at rest.

Kilohertz (kHz)

One thousand hertz. The audible range of human hearing spans approximately 20 Hz to 20 kHz, placing most sound frequencies within this scale. AM radio stations broadcast in the hundreds of kilohertz range (530–1700 kHz), and ultrasonic cleaning devices operate at 20–40 kHz — just above the threshold of human hearing.

Megahertz (MHz)

One million hertz. FM radio broadcasts occupy the 88–108 MHz band, television signals use various MHz allocations, and older computer processors were rated in megahertz (a 486 PC ran at 33–100 MHz). Wireless technologies like Bluetooth (2,400 MHz) and the 900 MHz ISM band also operate at this scale, though they are more commonly expressed in GHz.

Gigahertz (GHz)

One billion hertz. Modern CPU clock speeds are measured in gigahertz — a 3.5 GHz processor executes 3.5 billion cycles per second. Wi-Fi routers operate on the 2.4 GHz and 5 GHz bands, 5G mobile networks utilise frequencies up to several GHz, and microwave ovens heat food using 2.45 GHz radiation. This is arguably the most frequently referenced frequency unit in consumer technology.

Terahertz (THz)

One trillion hertz. Terahertz radiation occupies the electromagnetic spectrum between microwaves and infrared light. It is used in airport security imaging systems that can detect concealed objects without harmful radiation, pharmaceutical quality testing, and cutting-edge materials science research. Terahertz communication is also under active investigation as a potential backbone for future ultra-high-speed wireless networks.

Rotation per Minute (rpm)

Measures the number of full 360° rotations completed in one minute. Car engine tachometers display rpm — a typical idle speed is 600–1,000 rpm, while redline may reach 6,000–9,000 rpm. Hard drive platters spin at 5,400 or 7,200 rpm, vinyl record turntables rotate at 33⅓ or 45 rpm, and industrial centrifuges can exceed 100,000 rpm.

Degree per Second (deg/s)

Measures how many degrees of angular displacement occur each second. Gyroscope sensors in smartphones, drones, and inertial measurement units (IMUs) report rotational rates in deg/s. A smartphone gyroscope might have a range of ±2,000 deg/s, and drone flight controllers use deg/s readings to maintain stable orientation during flight.

Radian per Second (rad/s)

The SI unit of angular velocity, where one full rotation equals 2π radians (approximately 6.283 radians). Physics equations, mechanical engineering formulas, and control system transfer functions universally express angular velocity in rad/s. Converting from rpm or deg/s to rad/s is essential when plugging real-world measurements into theoretical calculations.

Real-World Use Cases

1. Comparing CPU and Processor Specifications

When evaluating computer hardware, processor speeds are listed in GHz. Comparing a 3.6 GHz desktop chip against specifications expressed in MHz (3,600 MHz) requires straightforward conversion — but mixed documentation sometimes presents values in different scales, making the converter a quick reference.

2. Tuning Radio and Wireless Equipment

Radio operators, wireless engineers, and hobbyists work across the frequency spectrum — from kHz-range shortwave bands to GHz-range satellite uplinks. Converting between scales ensures correct equipment tuning and compliance with frequency allocation regulations.

3. Translating Engine rpm to Angular Velocity for Engineering Calculations

Mechanical engineers designing gearboxes, flywheels, and rotating machinery often have engine speed in rpm but need angular velocity in rad/s to plug into torque, power, and momentum equations. The converter provides this translation without manual formula application.

4. Configuring Gyroscope and IMU Sensors

Robotics developers and drone engineers working with inertial measurement units encounter rotational data in deg/s from sensor datasheets but need rad/s for control algorithm implementations. The converter bridges the gap between hardware specifications and software requirements.

5. Audio Engineering and Sound Design

Sound engineers specify filter frequencies, equaliser bands, and oscillator settings in Hz or kHz. Converting between the two — particularly when moving between detailed parametric EQ settings (Hz) and broader spectrum descriptions (kHz) — ensures precise audio signal processing.

6. Physics and Engineering Coursework

Students solving problems involving wave frequency, rotational motion, and oscillations need to convert between Hz, rpm, deg/s, and rad/s depending on the formula being used. The converter eliminates arithmetic distractions so students can focus on understanding the physics.

7. Telecommunications and Network Planning

Network engineers planning cellular coverage, satellite links, and microwave backhaul connections work with frequencies spanning MHz to GHz. Converting between scales helps when cross-referencing equipment datasheets, regulatory filings, and propagation models that may express the same frequency band in different units.

Understanding the Relationship Between Frequency and Angular Velocity

Frequency (measured in hertz) and angular velocity (measured in rad/s or deg/s) describe the same rotational phenomenon from different perspectives:

• Frequency counts how many complete cycles occur per second.
• Angular velocity measures the rate of angular displacement — how fast the angle changes over time.

One complete cycle equals 360 degrees or 2π radians. Therefore, a frequency of 1 Hz corresponds to an angular velocity of 360 deg/s or 2π rad/s. The rpm unit adds another layer by counting cycles per minute rather than per second, introducing the factor of 60.

This triple relationship — Hz ↔ rpm ↔ rad/s — is fundamental in mechanical engineering, physics, and robotics, and this converter handles all three seamlessly.

Frequently Asked Questions

Q: How many frequency units does the converter support?

A: Nine units: Millihertz (mHz), Hertz (Hz), Kilohertz (kHz), Megahertz (MHz), Gigahertz (GHz), Terahertz (THz), Rotation per minute (rpm), Degree per second (deg/s), and Radian per second (rad/s).

Q: How do I convert GHz to MHz?

A: Enter your GHz value in the Value field, select Gigahertz (GHz) from the dropdown, and click Convert. The MHz equivalent will appear in the results. As a quick reference, multiply GHz by 1,000 to get MHz — so 2.4 GHz equals 2,400 MHz.

Q: What is the relationship between Hz and rpm?

A: One hertz equals 60 rpm. Since hertz measures cycles per second and rpm measures cycles per minute, multiplying the Hz value by 60 gives the rpm equivalent. Conversely, divide rpm by 60 to get hertz.

Q: Why are radians per second used instead of degrees per second in physics?

A: Radians are the natural mathematical unit for angles because they simplify many physics and calculus equations. Formulas for angular momentum, centripetal acceleration, and wave mechanics all produce cleaner expressions when angular velocity is in rad/s rather than deg/s.

Q: Can I convert audio frequencies with this tool?

A: Yes. Audio frequencies fall within the Hz and kHz range (approximately 20 Hz to 20 kHz for human hearing). Enter the frequency of any musical note, filter setting, or oscillator value and convert it to any other supported unit.

Q: What frequency does a car engine idle at in hertz?

A: A typical car engine idles at about 700–800 rpm. Dividing by 60 gives approximately 11.7–13.3 Hz. Enter your specific rpm in the converter to get the exact Hz, rad/s, and deg/s equivalents.

Q: Is there a difference between frequency and wavelength?

A: Yes. Frequency measures how many cycles occur per second, while wavelength measures the physical distance between consecutive peaks of a wave. They are inversely related — higher frequency means shorter wavelength. This tool converts between frequency units; it does not calculate wavelength.

Q: Is my data stored or shared?

A: No. The conversion runs entirely within the tool interface. Your input value and the converted results are never saved, logged, or transmitted to any external service.

Convert any frequency or rotational measurement between Millihertz, Hertz, Kilohertz, Megahertz, Gigahertz, Terahertz, rpm, deg/s, and rad/s — use the free Frequency Converter by Amaze SEO Tools for instant conversions across electronics, audio engineering, mechanical design, telecommunications, and physics!