A frequency converter handles unit conversions across electronics, audio, radio, and mechanical engineering. Enter any frequency value in any unit and see the equivalent in all other units instantly — from mHz (millihertz) for slow oscillations to THz for optical frequencies.
Frequency Converter
Common Frequency References
| Application | Frequency |
|---|---|
| Human hearing (low) | 20 Hz |
| AC mains (North America) | 60 Hz |
| Human hearing (high) | 20 kHz |
| FM radio band | 87.5–108 MHz |
| WiFi 2.4 GHz | 2,400–2,484 MHz |
| WiFi 5 GHz | 5,150–5,850 MHz |
| CPU clock (typical) | 2–5 GHz |
| 5G mmWave | 24–100 GHz |
How to Convert Frequency Units
Frequency measures how many cycles (oscillations, rotations, or events) occur per second. The base unit is the hertz (Hz), where 1 Hz = 1 cycle per second. Larger frequencies are expressed in kHz (thousands), MHz (millions), and GHz (billions) of cycles per second.
Converting Between Metric Prefixes
Frequency unit conversions within the metric system are straightforward powers of 1,000: 1 kHz = 1,000 Hz; 1 MHz = 1,000 kHz = 1,000,000 Hz; 1 GHz = 1,000 MHz. To convert up (Hz to kHz), divide by 1,000. To convert down (GHz to MHz), multiply by 1,000.
Converting RPM to Hz
RPM (revolutions per minute) to Hz: divide by 60. Example: a 1,800 RPM motor shaft = 1,800/60 = 30 Hz. This is useful in vibration analysis, where you want to compare motor rotational frequency to natural frequencies of the structure. Rad/s (angular frequency) = Hz × 2π, which appears in circuit analysis and control systems.
Practical Applications
Audio engineers work in Hz–kHz (20 Hz to 20 kHz audio spectrum). RF engineers work in MHz–GHz (broadcast, cellular, WiFi, radar). CPU and memory performance is measured in GHz. Vibration analysis uses Hz and RPM interchangeably. Power systems use 50 or 60 Hz. Each domain has its preferred unit — this converter handles all of them.
Frequently Asked Questions
How do I convert RPM to Hz?
Divide RPM by 60. One revolution per minute = 1/60 revolutions per second = 1/60 Hz. For example, 3600 RPM = 3600/60 = 60 Hz. This is why a 3600 RPM synchronous motor runs at exactly the 60 Hz grid frequency in North America.
What is the difference between Hz and rad/s?
Hertz (Hz) measures frequency in cycles per second. Radians per second (rad/s) measures angular frequency. Since one full cycle = 2π radians, the conversion is: rad/s = Hz × 2π, or Hz = rad/s ÷ 2π. In electronics, angular frequency (ω = 2πf) appears in reactance formulas and circuit analysis.
How many Hz is 5G?
5G networks operate across multiple frequency bands. Sub-6GHz 5G typically runs at 600 MHz to 6 GHz (600,000,000 to 6,000,000,000 Hz). mmWave 5G operates at 24–100 GHz (24,000,000,000 to 100,000,000,000 Hz). Most 5G phones use sub-6GHz for wide coverage and mmWave for high-speed hotspots.
What frequency range can humans hear?
Humans typically hear from 20 Hz to 20,000 Hz (20 kHz), though this narrows with age. Below 20 Hz is infrasound (felt, not heard). Above 20 kHz is ultrasound. Most audio equipment is rated from 20 Hz to 20 kHz. A standard piano covers roughly 27.5 Hz (lowest A) to 4,186 Hz (highest C).
Is this frequency converter free?
Yes, completely free with no signup required. All conversions run instantly in your browser.