Free Frequency Converter
Convert between Hz, kHz, MHz, GHz, and RPM. Instant frequency unit conversion for electronics, audio, radio, and engineering.
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1 Gigahertz (GHz) =
Formula
1 kHz = 1,000 Hz | 1 MHz = 1,000 kHz | 1 GHz = 1,000 MHz | 1 RPM = 1/60 HzHow to Convert Frequency Units
Frequency measures how many times something repeats per unit time. This converter normalizes to Hertz (cycles per second) and supports the units used in electronics, audio, radio, and mechanical engineering.
Frequency Units Explained
- Hertz (Hz) — the SI unit. 1 Hz = 1 cycle per second. Used for audio, AC power (50/60 Hz), and low-frequency signals.
- Kilohertz (kHz) — 1,000 Hz. Used for AM radio and audio sampling.
- Megahertz (MHz) — 1,000,000 Hz. Used for FM radio, TV, and older processors.
- Gigahertz (GHz) — 1,000,000,000 Hz. Used for WiFi, cellular, modern CPUs, and microwave ovens.
- RPM — revolutions per minute. Used for engines, hard drives, fans, and rotating machinery.
Common Frequency References
- US AC power: 60 Hz (50 Hz in Europe/Asia)
- Musical note A4: 440 Hz
- WiFi 2.4 GHz band: 2,400-2,500 MHz
- WiFi 5 GHz band: 5,150-5,850 MHz
- Microwave oven: 2.45 GHz
- Car engine idle: ~700-1,000 RPM
- SSD (no RPM): 0 RPM — no moving parts
Frequently Asked Questions
What is a Hertz?
A Hertz (Hz) is one cycle per second. It's the SI unit of frequency, named after Heinrich Hertz. A 60 Hz signal completes 60 cycles every second.
How does RPM relate to Hertz?
RPM (revolutions per minute) converts to Hz by dividing by 60. For example, 3,600 RPM = 60 Hz. A car engine at 3,000 RPM spins at 50 Hz.
What frequency is AM and FM radio?
AM radio operates from 535 kHz to 1,705 kHz. FM radio operates from 87.5 MHz to 108 MHz. These are much lower frequencies than WiFi (2.4 GHz and 5 GHz).
What does GHz mean for processors?
A processor's GHz rating indicates clock speed — how many billion cycles it completes per second. A 3.5 GHz CPU performs 3.5 billion clock cycles per second, though actual performance depends on many other factors.
What frequencies can humans hear?
The human hearing range is approximately 20 Hz to 20,000 Hz (20 kHz). Bass sounds are below 250 Hz, midrange is 250-4,000 Hz, and treble is above 4,000 Hz. Hearing high frequencies decreases with age.