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Frequency Converter

Time & Speed

Convert frequency units instantly — hertz, kilohertz, megahertz, gigahertz, terahertz, RPM, and RPS. Ideal for electronics, motors, and wireless tech.

Reviewed by the thecalcu.com team · Last updated July 1, 2026

From
To
All conversionsfor 1 Megahertz (MHz)
Hertz (Hz)1000000
Kilohertz (kHz)1000
Megahertz (MHz)1
Gigahertz (GHz)0.001
Terahertz (THz)0.000001
RPM (rev/min)60000000
RPS (rev/s)1000000

What is a Frequency?

A Frequency Converter translates frequency values between the units used in electronics, wireless communications, mechanical engineering, and physics, hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz), revolutions per minute (RPM), and revolutions per second (RPS).

Frequency is the number of times a repeating event occurs per unit of time. In the SI system, it is measured in hertz (Hz), where 1 Hz = one cycle per second. The same physical concept, periodic repetition, is expressed in wildly different units depending on whether the context is electrical, mechanical, or electromagnetic.

India's relationship with frequency is pervasive. The national power grid runs at exactly 50 Hz. Mobile networks occupy spectrum from 600 MHz to 26 GHz depending on the technology generation. Indian car engines rev from idle (800 RPM) to redline (7,000 RPM). Ceiling fans turn at 300–400 RPM. Wi-Fi routers broadcast at 2.4 GHz and 5 GHz. All India Radio's FM stations sit between 88 and 108 MHz. A modern Snapdragon processor clocks at 3.2 GHz.

The unit fragmentation is real: a vibration engineer calculates resonance in Hz, the client's maintenance team reads the tachometer in RPM, and the motor nameplate shows synchronous speed in RPM derived from the 50 Hz grid. This converter bridges these contexts instantly.

For the inverse relationship between frequency and time period (period = 1 ÷ frequency), see the Time Converter. For rotational mechanics, see the Angle Converter for angular displacement.

Why Use a Frequency Converter?

Three practical domains generate the most conversions:

Rotating machinery: Vibration analysts, maintenance engineers, and motor specialists constantly convert between RPM (tachometer readings) and Hz (vibration analyser outputs). A machine running at 1,450 RPM produces a fundamental vibration frequency of 1,450/60 = 24.17 Hz. Harmonics at 48.3 Hz, 72.5 Hz are then checked against structural resonances.

Wireless and telecom: India's 5G rollout involves spectrum across 700 MHz, 3.5 GHz, and 26 GHz bands. Network engineers, spectrum planners, and TRAI regulatory filings regularly cross-reference frequency bands expressed in MHz and GHz.

Embedded systems and electronics: Microcontroller clock speeds (8 MHz, 16 MHz, 240 MHz) are specified in MHz but timer configurations operate in Hz. A developer setting a 100 ms interrupt period needs to know their 16 MHz crystal generates 16,000,000 cycles per second.

Who Should Use This Converter?

Electronics engineers and embedded developers setting oscillator frequencies, timer periods, and PWM duty cycles where MHz clock speeds and Hz interrupt rates must interoperate.

Mechanical engineers and maintenance technicians performing vibration analysis on rotating equipment, converting RPM tachometer readings to Hz for FFT spectrum analysis.

Telecom and RF engineers working with India's spectrum allocations (TRAI band plans) where 4G LTE and 5G NR bands span MHz and GHz.

Physics and electronics students working on wave optics, electromagnetic spectrum problems, and AC circuit analysis in CBSE/JEE preparation where frequency and wavelength interrelate.

Ham radio operators and aviation enthusiasts working with frequencies across the MHz range. Pair with the Time Converter to relate frequency to signal period.

What Insights Does the Frequency Converter Give You?

The primary output shows full-precision results, 2.4 GHz renders as exactly 2,400,000,000 Hz or 2,400 MHz, not a rounded estimate.

The reference table shows all 7 units simultaneously. Entering 50 Hz (India's grid frequency) immediately shows: 0.05 kHz, 0.00005 MHz, 0.00000005 GHz, 3,000 RPM, 50 RPS, confirming that India's 4-pole motors at 50 Hz grid frequency have a synchronous speed of 1,500 RPM (displayed via the RPM row = 3,000; divide by 2 for 4 poles).

Practical frequency landmarks:

Context Frequency
India grid (AC mains) 50 Hz
Human hearing upper limit ~20,000 Hz (20 kHz)
AM radio (India) 530–1,620 kHz
FM radio (India) 88–108 MHz
Wi-Fi 2.4 GHz band 2,400–2,484 MHz
5G Sub-6 (India mid-band) 3,300–3,670 MHz

How to use this Frequency calculator

  1. Select your source unit from the FROM dropdown, e.g. RPM (rev/min).
  2. Enter your value, e.g. 1450 for a motor running at 1,450 RPM.
  3. Select your target unit from the TO dropdown, e.g. Hertz (Hz).
  4. The result appears instantly, 1,450 RPM = 24.17 Hz.
  5. Use ⇅ to swap FROM and TO.
  6. View the reference table for your frequency in all 7 units at once.
  7. Copy the URL to share or bookmark the conversion.

Formula & Methodology

All units convert to and from hertz (Hz) using exact multipliers:

| Unit | Symbol | Hertz (toBase) |
|---|---|---|
| Hertz | Hz | 1 (base) |
| Kilohertz | kHz | 1,000 |
| Megahertz | MHz | 1,000,000 |
| Gigahertz | GHz | 1,000,000,000 |
| Terahertz | THz | 1,000,000,000,000 |
| Revolutions per minute | RPM | 1/60 = 0.01666… |
| Revolutions per second | RPS | 1 (= Hz) |

Conversion formula: Result = Input × (F_from ÷ F_to)

Worked example, motor synchronous speed:

An Indian 4-pole induction motor on a 50 Hz grid, what is its synchronous speed in RPM?

Synchronous speed = (120 × frequency) ÷ poles                   = (120 × 50) ÷ 4                   = 6,000 ÷ 4                   = 1,500 RPM  Cross-check via converter: 50 Hz × 60 = 3,000 RPM (for 2-pole) ÷ 2 (for 4-pole) = 1,500 RPM ✓

Electromagnetic frequency–wavelength reference (c = 3 × 10⁸ m/s):

| Band | Frequency | Wavelength |
|---|---|---|
| AM Medium Wave | 1 MHz | 300 m |
| FM Radio | 100 MHz | 3 m |
| Wi-Fi 2.4 GHz | 2,400 MHz | 12.5 cm |
| 5G mmWave | 26,000 MHz | 11.5 mm |

Related Tools

You may also find these useful: Military Time Converter.

Frequently Asked Questions

A frequency converter translates a frequency value between different unit systems, such as from megahertz (MHz) to gigahertz (GHz), or from RPM to hertz (Hz). Frequency measures how many times a periodic event occurs per second. It is expressed in hertz (Hz) for electromagnetic waves and oscillators, in MHz and GHz for wireless communications and processors, and in RPM for rotating machinery like engines and motors.
These are all units of frequency differing by factors of 1,000. 1 kHz = 1,000 Hz, 1 MHz = 1,000,000 Hz, and 1 GHz = 1,000,000,000 Hz. In context: human hearing spans 20 Hz to 20 kHz; AM radio broadcasts at 530–1,600 kHz; FM radio at 88–108 MHz; Wi-Fi at 2.4 GHz or 5 GHz; modern smartphone processors at 2–4 GHz; and terahertz (THz) waves are used in security scanners and scientific spectroscopy.
Divide RPM by 60 to get Hz, since there are 60 seconds in a minute. For example, an engine running at 3,000 RPM completes 3,000/60 = 50 revolutions per second = 50 Hz. This conversion is important in vibration analysis, when a rotating component's frequency in Hz matches a structural resonance frequency, it can cause problematic vibration amplification.
India's national electrical grid operates at 50 Hz, meaning AC current alternates direction 50 times per second. This is the standard for most of Asia, Europe, Africa, and Australia. North America uses 60 Hz. At 50 Hz, one full AC cycle takes 1/50 = 20 milliseconds. This matters for appliances: motors, synchronous clocks, and some lighting equipment designed for 60 Hz may not perform correctly at 50 Hz, or may need a power frequency converter (a different kind of device from this unit converter).
India's 5G spectrum, auctioned in 2022, covers multiple bands. Sub-6 GHz bands (600 MHz, 700 MHz, 1,800 MHz, 2,100 MHz, 2,300 MHz, 2,500 MHz, 3,300–3,670 MHz) provide broad coverage with moderate speed. The 26 GHz mmWave band offers very high speeds over short distances and is being deployed in dense urban and enterprise settings. Telecom operators Jio, Airtel, and Vi hold licences across these bands.
RPM (revolutions per minute) is a measure of rotational speed, how many complete rotations a shaft or wheel makes per minute. Indian car engines typically redline at 6,000–7,500 RPM for petrol and 4,000–5,000 RPM for diesel. Ceiling fans operate at 300–400 RPM. Industrial motors run at 1,500 or 3,000 RPM (synchronous speeds for 4-pole and 2-pole motors on India's 50 Hz grid). Hard disk drives spin at 5,400 or 7,200 RPM.
Select your source unit from the FROM dropdown, for example, 'RPM (rev/min)'. Enter your value, such as 3000 for an engine running at 3,000 RPM. Choose your target unit from the TO dropdown, for example, 'Hertz (Hz)'. The result appears instantly: 3,000 RPM = 50 Hz. Use the ⇅ swap button to reverse, and view the reference table to see your frequency in all 7 units simultaneously.
Terahertz (THz) waves occupy the electromagnetic spectrum between microwave and infrared, ranging from 0.1 to 10 THz (100 GHz to 10,000 GHz). They can penetrate clothing and packaging but are non-ionising and harmless, making them useful for security scanners at airports, medical imaging, and semiconductor quality inspection. THz spectroscopy is used in pharmaceutical research to identify molecular fingerprints. India's DRDO and IITs have active research programmes in THz imaging.
Modern smartphone and laptop processors run at clock frequencies of 1.5–4.5 GHz, meaning the processor completes 1.5 to 4.5 billion cycles per second. Each clock cycle allows the processor to execute one or more simple operations. Higher clock frequency generally means faster single-threaded performance, though modern CPUs execute multiple operations per cycle (IPC) making raw GHz a partial picture. Apple's M-series chips at 3.5–4.5 GHz outperform Intel chips at similar frequencies due to higher IPC.
For electromagnetic waves in a vacuum (including light and radio waves), frequency and wavelength are related by: wavelength (λ) = speed of light (c) ÷ frequency (f). The speed of light c = 299,792,458 m/s ≈ 3 × 10⁸ m/s. A 2.4 GHz Wi-Fi signal has wavelength = (3 × 10⁸) ÷ (2.4 × 10⁹) = 0.125 m = 12.5 cm. This is why 2.4 GHz antennas are about 6 cm long (quarter-wavelength). See the [Time Converter](/time-converter/) for period-to-frequency relationships (period = 1 ÷ frequency).
India's AM radio (Medium Wave) broadcast band spans 530 kHz to 1,620 kHz (0.53–1.62 MHz), with All India Radio (AIR) and private stations occupying assigned frequencies. FM radio uses 88 MHz to 108 MHz, with most Indian city stations clustered in this band. Digital radio is being piloted in major cities. In addition, AIR shortwave broadcasts for international reach use frequencies in the 3–30 MHz (3,000–30,000 kHz) range.
The synchronous speed of an AC induction motor depends on the supply frequency and the number of magnetic poles: speed (RPM) = (120 × frequency) ÷ number of poles. In India at 50 Hz, a 2-pole motor runs at 3,000 RPM synchronous speed and a 4-pole motor at 1,500 RPM. Actual rotor speed is slightly lower due to slip (typically 3–5%), giving nominal speeds of 2,880 RPM and 1,440 RPM respectively, figures common on motor nameplates across Indian industry.
Also known as
Hz to kHzMHz to GHzfrequency unit conversionhertz convertercycles per second converterkilohertz to megahertzGHz to MHzradio frequency converterwave frequency converter