Free Online Frequency Converter
Frequency converts across Hz, kHz, MHz, GHz, RPM, BPM and the reciprocal period in seconds (1 Hz = 60 BPM = 60 RPM).
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How to Use This Converter
- Pick the input unit in From.
- Pick the target unit in To (period (s) flips the reciprocal).
- Type the frequency value; the result and factor appear instantly.
- Tap swap to reverse direction.
What Is a Frequency Converter?
Frequency is cycles per second; the SI unit is the hertz. Audio sample rates sit in the tens of kHz (CDs at 44.1 kHz, professional audio at 48 or 96 kHz). Radio spans MHz and GHz. Engines spin in RPM, where 3000 RPM is exactly 50 Hz. Songs sit at 60–200 BPM, and 60 BPM equals 1 Hz exactly.
The twist is that period is the reciprocal of frequency. A 1 Hz wave has a 1-second period; a 1000 Hz tone has a 1 ms period; a 60 BPM song has a 1-second beat interval. Audio engineers, MIDI programmers, drummers calculating delay times in milliseconds and motor technicians comparing RPM against AC frequency all flip between the two.
The tool handles the reciprocal conversion automatically when you switch between a frequency unit and the period (s) option.
Frequently Asked Questions
What is frequency?
MHz to Hz?
What about wavelength?
Published by the WeGotEveryTool team. We build and test every tool in-house and update pages when the underlying spec, formula, or recommendation changes.
Reviewed: May 2026. Disclaimer: this tool is provided as-is for general informational use. For decisions with material consequences (medical, legal, financial, security) verify results against a qualified professional source.
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