Frequency Unit Converter

Convert between all frequency units instantly. Our comprehensive frequency converter handles hertz (Hz), kilohertz (kHz), megahertz (MHz), gigahertz (GHz), RPM, BPM, and all common frequency measurements for electronics, radio communications, computer processors, and automotive applications.

Quick Frequency Conversions

From	To	Common Use
1000 Hz to kHz	1 kHz	Audio frequencies
2.4 GHz to MHz	2400 MHz	WiFi, Bluetooth
3000 RPM to Hz	50 Hz	Engine speed
60 BPM to Hz	1 Hz	Heart rate, music tempo
5 GHz to Hz	5,000,000,000 Hz	WiFi 5/6

Understanding Frequency Units

Frequency measures how often a repeating event occurs per unit of time. The SI unit is the hertz (Hz), equal to one occurrence per second.

Metric Frequency Units (SI)

Hertz (Hz) - Base SI unit

• 1 Hz = 1 cycle per second
• Named after Heinrich Hertz (1857-1894)
• Used: Low-frequency applications, vibrations

Kilohertz (kHz) - Thousands of hertz

• 1 kHz = 1,000 Hz
• Used: AM radio, audio frequencies, ultrasound
• Example: AM radio broadcasts at 530-1700 kHz

Megahertz (MHz) - Millions of hertz

• 1 MHz = 1,000,000 Hz = 1,000 kHz
• Used: FM radio, TV, older CPUs, NMR spectroscopy
• Example: FM radio 88-108 MHz

Gigahertz (GHz) - Billions of hertz

• 1 GHz = 1,000,000,000 Hz = 1,000 MHz
• Used: Modern CPUs, WiFi, microwave ovens, satellite communications
• Example: 3.5 GHz CPU, 2.4/5 GHz WiFi

Terahertz (THz) - Trillions of hertz

• 1 THz = 1,000,000,000,000 Hz = 1,000 GHz
• Used: Infrared spectroscopy, security imaging, 6G research
• Example: Far-infrared light ~100 THz

Rotational Frequency Units

RPM (Revolutions per Minute)

• 1 RPM = 1/60 Hz ≈ 0.01667 Hz
• Used: Engine speed, motors, fans, hard drives, centrifuges
• Example: Car engine 800-7000 RPM

RPS (Revolutions per Second)

• 1 RPS = 1 Hz
• Used: High-speed machinery, turbines
• Direct conversion to hertz

Radians per Second (rad/s)

• Angular frequency: ω = 2πf
• 1 rad/s = 1/(2π) Hz ≈ 0.159 Hz
• Used: Physics, engineering, control systems

Other Frequency Units

BPM (Beats per Minute)

• 1 BPM = 1/60 Hz
• Used: Heart rate, music tempo
• Example: Resting heart rate ~60-100 BPM

Cycles per Second (cps)

• 1 cps = 1 Hz
• Historical name for hertz (pre-1960s)
• Largely obsolete, replaced by Hz

Real-World Applications

Electronics & Computing

Computer Processors (CPU/GPU)

• Modern desktop CPU: 3.0-5.0 GHz
• Server CPU: 2.0-4.0 GHz base, 5.0+ GHz boost
• Smartphone processor: 1.8-3.2 GHz
• GPU core clock: 1.5-2.5 GHz

Computer Memory

• DDR4 RAM: 2400-3200 MHz
• DDR5 RAM: 4800-6400 MHz
• CPU cache speed: matches CPU clock

Crystal Oscillators

• Watch crystal: 32.768 kHz
• USB: 48 MHz
• Ethernet: 25/125 MHz

Radio Communications

AM Radio Broadcasting

• Long wave: 153-279 kHz
• Medium wave: 530-1700 kHz (US)
• Short wave: 1.6-30 MHz

FM Radio Broadcasting

• FM band: 88-108 MHz
• Channel spacing: 200 kHz (US)

Television Broadcasting

• VHF Low (2-6): 54-88 MHz
• VHF High (7-13): 174-216 MHz
• UHF (14-69): 470-890 MHz

Wireless Communications

• CB Radio: 27 MHz
• 2G (GSM): 850/900/1800/1900 MHz
• 3G: 850/900/1700/1900/2100 MHz
• 4G LTE: 600 MHz - 6 GHz
• 5G: 600 MHz - 71 GHz (mmWave)

WiFi Standards

• WiFi 4 (802.11n): 2.4 GHz, 5 GHz
• WiFi 5 (802.11ac): 5 GHz
• WiFi 6 (802.11ax): 2.4 GHz, 5 GHz
• WiFi 6E: 2.4 GHz, 5 GHz, 6 GHz

Bluetooth

• Classic Bluetooth: 2.4-2.485 GHz
• BLE (Bluetooth Low Energy): 2.4 GHz

Automotive

Engine Speed (RPM)

• Idle speed: 600-1000 RPM
• Normal driving: 1500-3000 RPM
• Highway cruising: 2000-3000 RPM
• Redline (gasoline): 6000-9000 RPM
• Redline (diesel): 4000-5500 RPM
• Formula 1: 15,000 RPM (limited)

Wheel Rotation

• Highway (70 mph): ~850 RPM (typical car)
• City (30 mph): ~365 RPM

Audio & Music

Audio Frequency Ranges

• Sub-bass: 20-60 Hz
• Bass: 60-250 Hz
• Low midrange: 250-500 Hz
• Midrange: 500-2000 Hz
• Upper midrange: 2-4 kHz
• Presence: 4-6 kHz
• Brilliance: 6-20 kHz

Human Hearing

• Range: 20 Hz - 20 kHz (young adults)
• Age 50+: typically 20 Hz - 12 kHz
• Speech: 300 Hz - 3 kHz

Musical Notes (Middle Octave)

• Middle C (C4): 261.63 Hz
• A4 (Concert pitch): 440 Hz
• Standard tuning reference

Music Tempo (BPM)

• Largo: 40-60 BPM (very slow)
• Adagio: 66-76 BPM (slow)
• Andante: 76-108 BPM (walking pace)
• Moderato: 108-120 BPM (moderate)
• Allegro: 120-168 BPM (fast)
• Presto: 168-200 BPM (very fast)

Medical

Heart Rate (BPM)

• Resting (adult): 60-100 BPM
• Athletes: 40-60 BPM
• Maximum (estimate): 220 - age
• Target exercise: 50-85% of maximum

Brain Waves (EEG)

• Delta: 0.5-4 Hz (deep sleep)
• Theta: 4-8 Hz (drowsiness)
• Alpha: 8-13 Hz (relaxed)
• Beta: 13-30 Hz (alert)
• Gamma: 30-100 Hz (concentration)

Medical Ultrasound

• Diagnostic imaging: 2-18 MHz
• Therapeutic: 0.7-3.3 MHz
• Doppler: 2-10 MHz

Power & Utilities

AC Power Frequency

• North America: 60 Hz
• Europe/Asia/Africa: 50 Hz
• Some countries: both (Japan)

Electrical Grid

• Standard tolerance: ±0.1 Hz
• Frequency stability critical for grid

Conversion Formulas

Basic Metric Conversions

Hertz ↔ Kilohertz

• kHz = Hz ÷ 1,000
• Hz = kHz × 1,000

Kilohertz ↔ Megahertz

• MHz = kHz ÷ 1,000
• kHz = MHz × 1,000

Megahertz ↔ Gigahertz

• GHz = MHz ÷ 1,000
• MHz = GHz × 1,000

Gigahertz ↔ Terahertz

• THz = GHz ÷ 1,000
• GHz = THz × 1,000

Rotational Conversions

RPM ↔ Hertz

• Hz = RPM ÷ 60
• RPM = Hz × 60

RPS ↔ Hertz

• Hz = RPS × 1
• RPS = Hz × 1

Radians/Second ↔ Hertz

• Hz = rad/s ÷ (2π)
• rad/s = Hz × (2π)

Music/Biology Conversions

BPM ↔ Hertz

• Hz = BPM ÷ 60
• BPM = Hz × 60

Common Frequency Standards

Clock Signals

Computer Buses

• PCI: 33/66 MHz
• PCIe 1.0: 2.5 GHz
• PCIe 2.0: 5 GHz
• PCIe 3.0: 8 GHz
• PCIe 4.0: 16 GHz
• PCIe 5.0: 32 GHz

Display Refresh Rates

• Standard monitor: 60 Hz
• Gaming monitor: 120/144/165/240/360 Hz
• VR headset: 90/120/144 Hz
• Cinema: 24 Hz
• NTSC TV: 59.94 Hz
• PAL TV: 50 Hz

Communication Standards

Satellite

• GPS L1: 1575.42 MHz
• GPS L2: 1227.60 MHz
• Satellite TV (Ku-band): 12-18 GHz

RFID

• Low frequency: 125-134 kHz
• High frequency: 13.56 MHz
• Ultra-high frequency: 860-960 MHz

NFC

• Operating frequency: 13.56 MHz

Frequency Converter FAQs

What is frequency?

Frequency is the number of times a repeating event occurs per unit of time. It's measured in hertz (Hz), where 1 Hz = 1 occurrence per second. Frequency describes oscillations, waves, rotation, and periodic events.

How do I convert Hz to MHz?

Formula: MHz = Hz ÷ 1,000,000

Examples:

• 1,000,000 Hz = 1 MHz
• 100,000,000 Hz = 100 MHz
• 2,400,000,000 Hz = 2,400 MHz = 2.4 GHz

Divide the hertz value by 1 million to get megahertz.

Hz to MHz converter →

How do I convert RPM to Hz?

Formula: Hz = RPM ÷ 60

Examples:

• 60 RPM = 1 Hz
• 3,000 RPM = 50 Hz
• 7,200 RPM = 120 Hz

Reverse: RPM = Hz × 60

This converts rotational speed (revolutions per minute) to frequency (cycles per second).

RPM to Hz converter →

What is 2.4 GHz in MHz?

2.4 GHz = 2,400 MHz

This is the common WiFi and Bluetooth frequency band. The 2.4 GHz band actually spans 2.4-2.4835 GHz (2400-2483.5 MHz).

GHz to MHz converter →

What frequency is middle C?

Middle C (C4) = 261.63 Hz

Concert pitch reference:

• A4 = 440 Hz (standard tuning)
• C4 = 261.63 Hz (middle C)

Each octave doubles or halves the frequency:

• C5 = 523.25 Hz (one octave up)
• C3 = 130.81 Hz (one octave down)

How many GHz is my processor?

Modern consumer processors typically run at:

Desktop CPUs:

• Base clock: 3.0-4.0 GHz
• Boost clock: 4.5-5.7 GHz
• Example: Intel i9-13900K: 3.0 GHz base, 5.8 GHz boost

Laptop CPUs:

• Base clock: 1.8-3.0 GHz
• Boost clock: 4.0-5.0 GHz

Smartphone CPUs:

• 1.8-3.2 GHz

Check your system specifications or use CPU monitoring software to see your processor's actual frequency.

What is 50 Hz vs 60 Hz power?

50 Hz: Used in Europe, Asia, Africa, Australia 60 Hz: Used in North America, parts of South America

This is the AC power frequency - how many times per second the current alternates direction:

• 50 Hz = 50 cycles/second
• 60 Hz = 60 cycles/second

Most modern electronics work with both. Some devices (motors, clocks) are frequency-specific.

How fast is 5 GHz WiFi?

5 GHz refers to the radio frequency, not the speed:

• Radio frequency: 5 GHz (5,000 MHz)
• Data speed: up to 1-3 Gbps (WiFi 5/6)

The 5 GHz band provides:

• Less interference than 2.4 GHz
• Faster potential speeds
• Shorter range

Actual WiFi speed depends on protocol (WiFi 5/6), channel width, and environment.

What RPM should my car idle at?

Normal idle RPM: 600-1000 RPM

By car type:

• Small car: 600-800 RPM
• Larger car/SUV: 700-900 RPM
• Diesel: 600-750 RPM
• Cold start: 1000-1500 RPM (temporarily)

In Hz: 600 RPM = 10 Hz, 1000 RPM ≈ 16.7 Hz

Rough idle, stalling, or high idle may indicate engine issues.

RPM to Hz converter →

Is BPM the same as Hz?

Not exactly, but related:

• 1 BPM = 1/60 Hz
• 60 BPM = 1 Hz
• 120 BPM = 2 Hz

BPM (beats per minute) is used for:

• Heart rate
• Music tempo

Hz (hertz) is cycles per second.

To convert: Hz = BPM ÷ 60

BPM to Hz converter →

Quick Reference Card

Common Frequencies:

• AC Power (US): 60 Hz
• AC Power (Europe): 50 Hz
• WiFi 2.4 GHz: 2,400 MHz
• WiFi 5 GHz: 5,000 MHz
• FM Radio: 88-108 MHz
• Microwave oven: 2.45 GHz
• Human hearing: 20 Hz - 20 kHz

Essential Conversions:

• 1 kHz = 1,000 Hz
• 1 MHz = 1,000 kHz = 1,000,000 Hz
• 1 GHz = 1,000 MHz = 1,000,000,000 Hz
• 1 RPM = 1/60 Hz ≈ 0.01667 Hz
• 60 RPM = 1 Hz
• 1 BPM = 1/60 Hz

Frequency Bands:

• Audio: 20 Hz - 20 kHz
• Radio: 3 kHz - 300 GHz
• Microwave: 300 MHz - 300 GHz
• Infrared: 300 GHz - 400 THz
• Visible light: 400-790 THz

Use our frequency converter for instant, accurate conversions between all units.