📢 Frequency Converter
Convert between hertz, kilohertz, megahertz, gigahertz, RPM and period.
What is this tool?
The Frequency Converter is a free online tool that instantly converts between all common units of frequency and its inverse, period. Whether you are designing an electronic circuit, tuning a radio, analyzing a vibration, or specifying a processor clock speed, this tool gives you the exact conversion without any mental math. Frequency describes how many times a repeating event occurs per second, measured in hertz (Hz). One hertz means one cycle per second. Electronics and telecommunications work with a vast range of frequencies, from a few hertz in audio circuits up to gigahertz in modern computer processors and wireless communications. Because the range spans so many orders of magnitude, engineers frequently need to convert between units like kilohertz (1,000 Hz), megahertz (1,000,000 Hz), and gigahertz (1,000,000,000 Hz). This converter also handles rotations per minute (RPM), which is commonly used for motors, hard drives, and turntables. Additionally, it can convert to period values — the time for one complete cycle — expressed in milliseconds, microseconds, or nanoseconds, since period is simply the reciprocal of frequency. All conversions happen locally in your browser for instant results.How it works
The converter is based on the fact that all frequency units are decimal multiples or related ratios of the hertz. One kilohertz (kHz) equals 1,000 Hz, one megahertz (MHz) equals 1,000,000 Hz, and one gigahertz (GHz) equals 1,000,000,000 Hz. Rotations per minute (RPM) equals Hz multiplied by 60, since there are 60 seconds in a minute. For period conversions, the tool uses the fundamental relationship Period = 1 / Frequency. So a 1,000 Hz signal has a period of 1 millisecond, a 1 MHz signal has a period of 1 microsecond, and a 1 GHz signal has a period of 1 nanosecond. The converter calculates period in seconds and then scales to milliseconds, microseconds, or nanoseconds as appropriate. When you enter a value in any field, the tool converts it to hertz as the common unit, then derives every other value. JavaScript double-precision arithmetic ensures accuracy across the full range from sub-hertz to hundreds of gigahertz.How to use
- Enter a frequency value in any unit field.
- All other fields update automatically.
- Switch between frequency and period outputs.
- Copy any result value with one click.
- Use the clear button to reset all fields.
Frequently Asked Questions
Frequently Asked Questions
What is the difference between Hz and RPM?
Hz measures cycles per second while RPM (revolutions per minute) measures revolutions per minute. To convert Hz to RPM, multiply by 60. For example, 60 Hz equals 3600 RPM.
How do I convert frequency to period?
Period is the reciprocal of frequency: Period = 1 / Frequency. So a 50 Hz signal has a period of 1/50 = 0.02 seconds = 20 milliseconds. This converter does the calculation for you automatically.
Why are there different frequency units?
The different units (Hz, kHz, MHz, GHz) exist because frequencies span an enormous range. Using MHz or GHz avoids writing many zeros. A 3.2 GHz processor would be 3,200,000,000 Hz, which is cumbersome to read.
Is this converter accurate for audio frequencies?
Yes. Audio frequencies range from about 20 Hz to 20,000 Hz (20 kHz). The converter handles this range with full precision, and is useful for audio engineering, music production, and acoustics work.
Tips & Advice
When working with frequencies, remember that each unit step (Hz to kHz to MHz to GHz) is a factor of 1,000, not 100. A common mistake is confusing MHz and GHz when comparing processor speeds or radio bands. For vibration analysis and rotating machinery, RPM is the standard; divide by 60 to get Hz. When dealing with period (the inverse of frequency), very high frequencies give very short periods — a 1 GHz signal repeats every nanosecond. Understanding both frequency and period gives you a complete picture of any oscillating system.