〰️ Frequency Converter
Convert between Hz, kHz, MHz, GHz, RPM, and rotations per second for audio, radio, electronics, and mechanical systems.
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Common Frequency Conversions
| Input | Unit | Result | Unit |
|---|---|---|---|
| 1 | Megahertz | 1000 | Kilohertz |
| 440 | Hertz | 0.44 | Kilohertz |
| 3000 | Revolutions per Minute | 50 | Hertz |
| 2.4 | Gigahertz | 2400 | Megahertz |
| 60 | Hertz | 3600 | Revolutions per Minute |
| 1 | Gigahertz | 1000 | Megahertz |
Formula Reference
1 kHz = 1,000 Hz • 1 MHz = 1,000,000 Hz • 1 GHz = 1,000,000,000 Hz RPM ↔ Hz: Hz = RPM ÷ 60 • RPM = Hz × 60 Period (time for one cycle): T = 1 ÷ f (e.g., 440 Hz → T ≈ 2.27 ms)
About Frequency Conversions
Frequency measures how often a repeating event occurs per unit time. The SI unit is the hertz (Hz), where 1 Hz means exactly one cycle per second. Frequency spans an extraordinary range in nature and technology: infrasound below 20 Hz (felt as vibration), the audible range for humans (20 Hz to 20,000 Hz), radio waves (kHz to GHz), and processor clock speeds (GHz). Each decade in frequency corresponds to a different domain of physics and engineering.
Audio frequencies span 20 Hz to 20,000 Hz (20 kHz). Bass frequencies below 250 Hz give music its warmth and power; midrange (250 Hz to 4 kHz) contains most speech clarity; treble (4–20 kHz) contributes brightness and definition. Subwoofers reproduce below 80 Hz; tweeters handle above 2,000 Hz. Musical pitch is frequency: the standard concert A above middle C is exactly 440 Hz, and each octave doubles the frequency (880 Hz, 1,760 Hz, etc.).
In mechanical and automotive contexts, frequency is expressed as RPM (revolutions per minute). To convert: RPM ÷ 60 = Hz (rotations per second). A car engine at 3,000 RPM rotates at 50 Hz. Industrial motors are commonly rated in Hz (the frequency of their AC power supply). Processors are clocked in gigahertz: a 3.5 GHz CPU completes 3.5 billion cycles per second — each cycle lasting about 0.286 nanoseconds.
Frequently Asked Questions
What is the human hearing frequency range?
The typical human hearing range is 20 Hz to 20,000 Hz (20 kHz), though this varies with age and exposure history. Most adults over 40 struggle to hear above 15–16 kHz. Dogs hear up to about 65 kHz; bats use ultrasound up to 200 kHz for echolocation. Infrasound below 20 Hz is felt as vibration rather than heard as sound.
How do I convert RPM to Hz?
Divide RPM by 60 to get Hz (cycles per second). For example, 3,000 RPM ÷ 60 = 50 Hz. This is relevant for motor frequencies, engine speeds, and centrifuge rotation rates. The reverse: Hz × 60 = RPM. At 60 Hz AC power, a synchronous motor with two poles rotates at 3,600 RPM; with four poles, 1,800 RPM.
What frequency is Wi-Fi?
Wi-Fi operates on two main frequency bands: 2.4 GHz and 5 GHz (and newer routers add 6 GHz under Wi-Fi 6E). The 2.4 GHz band penetrates walls better but is more congested. The 5 GHz band offers faster speeds but shorter range. These are radio frequencies, meaning the wireless signal itself oscillates at 2.4 billion or 5 billion times per second.
What does a CPU clock speed in GHz mean?
A 3.5 GHz processor completes 3.5 billion clock cycles per second. Each cycle is the smallest unit of processor work — one or more instructions can execute per cycle depending on architecture. Clock speed alone does not fully determine performance: the number of cores, instructions per cycle (IPC), cache size, and memory bandwidth all contribute. Higher GHz generally means faster single-threaded performance within the same processor family.
What is the difference between frequency and wavelength?
Frequency and wavelength are inversely related for any wave: wavelength = wave speed ÷ frequency (λ = v/f). For electromagnetic waves (radio, light) traveling at the speed of light (c ≈ 3×10⁸ m/s), a 2.4 GHz Wi-Fi signal has a wavelength of about 12.5 cm. A 440 Hz sound wave at room temperature (343 m/s) has a wavelength of about 78 cm. Higher frequency always means shorter wavelength for a given medium.
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All conversion results are provided for general informational purposes only. Our formulas use internationally recognized conversion factors; however, rounding may affect precision. Do not rely on these results for professional, medical, legal, or engineering decisions without independent verification. Read our full disclaimer.