440 Hz Tone Generator
A free online tone generator producing a pure 440 Hz signal in your browser. Concert A (standard). Pick a waveform, hit play, and adjust the volume slowly.
What is 440 Hz used for?
440 Hz is the modern international standard for concert A (A4). Almost all contemporary tuning is calibrated to this pitch.
For concert a (standard), set the volume to roughly 30% before pressing play. 440 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 440 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 440 Hz is approximately A4.
FAQs
Why does 440 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 440 Hz sounds quiet, distorted, or buzzy, your hardware is likely the limit — not the tone itself.
Is it safe to listen to 440 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 440 Hz?
440 Hz corresponds to approximately A4. For exact tuning, use the chromatic tuner.