How to convert frequency units?

1 kHz = 1000 Hz, 1 MHz = 1000 kHz = 10^6 Hz, 1 GHz = 1000 MHz = 10^9 Hz. To convert RPM to Hz, divide by 60.

What are common frequency reference values?

Mains electricity 50 Hz, CPU approximately 3-5 GHz, WiFi 2.4/5 GHz, visible light approximately 430-750 THz, human hearing range 20 Hz - 20 kHz.

What is the Hertz (Hz) unit?

Hertz is the SI unit of frequency, representing the number of periodic occurrences per second. 1 Hz = once per second. Common applications include AC frequency (50/60 Hz), radio frequency (GHz level), and processor frequency (GHz).

How to convert between GHz and MHz?

1 GHz = 1000 MHz, 1 MHz = 1000 kHz, 1 kHz = 1000 Hz. For example, 2.4 GHz WiFi frequency equals 2400 MHz.

📡 Frequency Converter

Convert between Hz, kHz, MHz, GHz, THz

Enter Value

Input Unit

Hertz (Hz)1000000

Kilohertz (kHz)1000

Megahertz (MHz)1

Gigahertz (GHz)0.001

Terahertz (THz)0.000001

RPM (rev/min)60000000

Frequency Converter Guide

This calculator converts between Hz, kHz, MHz, GHz, and other frequency units. Enter a value and select the unit to automatically convert to other units.

Frequency measures the number of vibrations or cycles per second, widely used in electronics, communications, audio, and radio. Understanding frequency conversion helps you interpret processor speeds, radio bands, and audio ranges.

Frequency Unit Conversion Reference

Common conversions:

- 1 kHz = 1,000 Hz - 1 MHz = 1,000 kHz = 1,000,000 Hz - 1 GHz = 1,000 MHz = 10^9 Hz

Common frequency references: - Human hearing range: 20Hz-20,000Hz - AM radio: 530-1,700 kHz - FM radio: 88-108 MHz - Mobile communications: 700MHz-5GHz - Wi-Fi: 2.4GHz / 5GHz - Computer CPU: 2-5GHz - 5G: 3.5GHz / 28GHz

Frequency-wavelength relationship: Wavelength = Speed of light ÷ Frequency Speed of light ≈ 3×10^8 m/s

This calculator is for reference only. Please verify results independently.

FAQ

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Frequency Converter Instructions

The frequency converter supports conversion between six frequency units: Hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), terahertz (THz), and RPM (revolutions per minute).

Frequency describes how many times a periodic event occurs per second, with the unit Hertz (Hz) meaning "once per second." From mains electricity at 50 Hz to CPU clock speeds in the GHz range, from radio waves to visible light, frequency spans more than 20 orders of magnitude. This tool helps you freely convert between these vastly different scales.

Frequency Unit Conversion Relationships

【Basic Relationships】
1 THz = 1000 GHz = 10^6 MHz = 10^9 kHz = 10^12 Hz
1 MHz = 1000 kHz = 1,000,000 Hz
1 kHz = 1000 Hz

【RPM to Hz】
1 rpm = 1/60 Hz ≈ 0.01667 Hz
1 Hz = 60 rpm

【Electromagnetic Spectrum (by frequency)】
Extremely Low Frequency (ELF): <300 Hz
Audio: 20 Hz - 20 kHz (human hearing range)
Radio: 3 kHz - 300 GHz
Microwave: 300 MHz - 300 GHz
Infrared: 300 GHz - 430 THz
Visible light: 430 THz - 750 THz
Ultraviolet/X-ray: >750 THz

Conversion Examples

📋

【Example 1】Computer CPU frequency Intel i9-14900K: up to 6.0 GHz = 6000 MHz = 6,000,000 kHz Each clock cycle: 0.167 nanoseconds 【Example 2】WiFi frequency 2.4 GHz WiFi = 2400 MHz = 2.4×10^9 Hz 5 GHz WiFi = 5000 MHz = 5×10^9 Hz Wavelength λ=c/f: 2.4 GHz → 12.5 cm, 5 GHz → 6 cm 【Example 3】Motor speed Washing machine spin: 1200-1400 rpm = 20-23.3 Hz (20-23 revolutions per second) Car engine idle: 700-900 rpm = 11.7-15 Hz F1 engine: >15,000 rpm = 250+ Hz 【Example 4】Music and acoustics Middle C (C4): 261.63 Hz Piano highest key C8: 4186.01 Hz Standard pitch A4: 440 Hz (international standard)

Important Notes

💡

- RPM (revolutions per minute) is rotational speed, not frequency, but can be converted to Hz by dividing by 60 - CPU frequency does not equal performance — architecture, core count, and cache are equally important - 5G millimeter wave (mmWave) frequencies of 24-40 GHz fall within the microwave range - Human hearing range is 20 Hz - 20 kHz; high-frequency hearing declines with age - Fiber optic communications use infrared light frequencies of approximately 100-400 THz

Application Scenarios

- Electronic engineering: Clock frequency design, filter cutoff frequency calculation
- Radio communications: Channel frequency conversion, antenna size calculation (λ=c/f)
- Audio processing: Sample rate settings (44.1 kHz / 48 kHz / 96 kHz)
- Mechanical engineering: Motor speed (rpm ↔ Hz), vibration analysis
- Medical equipment: MRI radio frequency (~128 MHz), ultrasound imaging (1-15 MHz)

Frequency — The Carrier of Information

Frequency is not just a physical quantity; it is the cornerstone of the modern information society. Claude Shannon, the father of information theory, proved that channel capacity C = B × log₂(1 + S/N) — bandwidth B (frequency range) directly determines the upper limit of information transmission rate. This is why 5G needs higher frequencies (more bandwidth) to achieve faster data rates.

From another perspective, every physical phenomenon has its characteristic frequency: brain waves (0.5-100 Hz), heartbeat (1-2 Hz), vocal cord vibration (100-1000 Hz), phone vibration (100-200 Hz). Measuring and analyzing these frequency signals has become a core technology in medical diagnostics, seismic monitoring, speech recognition, and other fields.

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