Frequency Converter
Convert between Hz, kHz, MHz, GHz, RPM and BPM.
Convert between Hz, kHz, MHz, GHz, RPM and BPM.
This free Frequency Converter from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the Frequency Converter
- Pick the unit you have and the unit you want.
- Enter the value.
- Read the converted value - most tools update as you type.
- Use the swap button to reverse the direction if needed.
What you can do with the Frequency Converter
- Convert recipe ingredients between metric and imperial.
- Translate engineering specs across systems.
- Check shipping weights and dimensions before ordering.
- Quick travel conversions for distance, speed and currency.
Why use KX Toolkit's Frequency Converter
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
For very large or very small numbers, use the scientific-notation option - it avoids floating-point rounding errors.
Related Unit Converter Tools
If you find this tool useful, explore the full Unit Converter Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
How do Hz, kHz, MHz, and GHz relate?
Each step is a factor of 1,000. One kilohertz (kHz) is 1,000 Hz, one megahertz (MHz) is 1,000,000 Hz, and one gigahertz (GHz) is 1,000,000,000 Hz. CPUs run at GHz, FM radio is at around 100 MHz, AM radio at about 1 MHz, and audio frequencies at 20 Hz to 20 kHz. The converter shifts the decimal accordingly.
How do I convert RPM to Hz?
Divide RPM by 60 to get Hz, since one revolution per minute equals 1/60 cycles per second. So 3,600 RPM equals 60 Hz, which is the speed of a 60 Hz synchronous motor. Going the other way, multiply Hz by 60 to get RPM. The converter is handy when matching motor specs from different regions and standards.
What is BPM and how does it relate to Hz?
BPM (beats per minute) is used in music. Divide BPM by 60 to get Hz. So a 120 BPM track has a kick drum at 2 Hz. BPM is also used for heart rate; 60 BPM equals 1 Hz. The converter translates between BPM, Hz, and RPM, which is convenient for producers, drummers, and biomedical work.
What frequencies do humans hear?
Healthy young ears hear 20 Hz to 20 kHz. Older adults usually lose the high end, dropping to about 14 kHz. Below 20 Hz is infrasound (felt as vibration), and above 20 kHz is ultrasound. The converter is useful for audio engineering, hearing test calibration, and converting frequency specifications between scientific and audio notation.
Why is European mains 50 Hz and US mains 60 Hz?
It is a historical choice. Europe standardised on 50 Hz with 230 V, while the US settled on 60 Hz with 120 V. Both work fine, but motors, transformers, and clocks designed for one frequency may not run correctly on the other. Modern electronics with switching power supplies usually accept both. The converter is helpful for engineering documentation.
How do I convert a wavelength to a frequency?
Use frequency = speed of light / wavelength. For radio, light travels at 3 x 10^8 m/s, so a 3 m wavelength corresponds to 100 MHz. For sound, use the speed of sound (about 343 m/s) instead. The frequency converter handles the time-domain values; pair it with a wavelength tool when you need to bridge between time and space.
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