261.63 Hz Tone Generator
A free online tone generator producing a pure 261.63 Hz signal in your browser. Middle C (C4). Pick a waveform, hit play, and adjust the volume slowly.
What is 261.63 Hz used for?
261.63 Hz is middle C — the C immediately below the A=440 reference pitch. The cornerstone of piano notation.
For middle c (c4), set the volume to roughly 30% before pressing play. 261.63 Hz can sound deceptively quiet at full volume — always start low to protect your speakers and ears.
How to use it
Press the play button on the preview above to hear 261.63 Hz immediately. To customize the waveform (sine, square, sawtooth, triangle), tweak the volume curve, or add a second tone for beat-frequency comparison, open the full tone generator. The closest musical pitch to 261.63 Hz is approximately C4.
FAQs
Why does 261.63 Hz sound different on different speakers?
Speaker frequency response varies dramatically. Small monitors and laptop speakers struggle below about 80 Hz; tweeters distort above 16 kHz on cheaper systems. If 261.63 Hz sounds quiet, distorted, or buzzy, your hardware is likely the limit — not the tone itself.
Is it safe to listen to 261.63 Hz?
At reasonable volumes, yes. Sustained exposure to any frequency at high volume can damage your hearing. Always start at 0 volume, ramp up slowly, and don't wear headphones at full volume on this page.
What's the closest musical note to 261.63 Hz?
261.63 Hz corresponds to approximately C4. For exact tuning, use the chromatic tuner.