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432 Hz
Free healing-frequency, solfeggio & Om sound generator
Play an exact 432 Hz tone, or a soft 432 Hz drone, with one tap — no app, no video ads.
Start at a low volume and turn up slowly. Pure tones can sound louder than music at the same setting, especially higher frequencies.
| Frequency | 432 Hz (432 vibrations per second) |
|---|---|
| Nearest musical note (A=440) | A4 −32 cents |
| Wavelength in air | about 79 cm |
| Period of one cycle | 2.31 ms |
| Solfeggio syllable | n/a (tuning standard) |
| Which set | Not solfeggio — A=432 tuning |
| Popular claim | Promoted as "natural" or "cosmic" tuning that sounds warmer and calmer than A=440 (a claim, not a demonstrated effect) |
432 Hz comes from a tuning debate rather than the solfeggio scale. In music, a pitch standard sets the frequency of the note A above middle C (A4), and every other note is tuned relative to it. Today's international standard is A = 440 Hz. "432 Hz music" means music tuned with A = 432 Hz instead — everything is shifted down by about 32 cents, roughly a third of a semitone.
The tone on this page is that A: a sine wave at exactly 432 Hz. If you want whole chords and drones in 432 tuning, open the main generator and choose "A4 = 432 Hz" in the tuning menu.
Before the 20th century, pitch standards varied widely from city to city and orchestra to orchestra. France set an official A of 435 Hz in 1859. Giuseppe Verdi is often said to have favoured a lower pitch than the rising standards of his day, which is why A = 432 Hz is sometimes called "Verdi tuning", although the historical details are disputed. A = 440 Hz was already widely used before it was agreed at an international conference in 1939, and it was adopted as an ISO standard in 1955.
The modern A = 432 movement grew online in the 2000s and 2010s, with claims that 432 Hz is "mathematically consistent with the universe" or matches natural resonances, and that 440 Hz was imposed for sinister reasons. None of these holds up: the numbers depend on using seconds as the unit of time, which is a human convention, and the stories about A = 440 lack historical support.
Many people say 432 Hz tuning sounds warmer or softer, and that is a real preference for them. A small double-blind pilot study published in 2019 (33 volunteers) compared music tuned to 432 Hz and 440 Hz and reported a slightly lower average heart rate during the 432 Hz version, with little difference on other measures. The authors described it as preliminary, and it has not been confirmed by larger trials. It is reasonable to say 432 Hz may be pleasant to relax with; it is not reasonable to say it heals.
Worth knowing: without a reference, most listeners cannot tell whether a single tone is 432 or 440 Hz. Try it yourself — play this page, then the 528 Hz tone, and notice how much bigger that jump is.
Nobody has shown that a particular frequency heals the body, repairs DNA or treats a medical condition. The specific benefits attached to each solfeggio number are claims from the books and videos that popularised them, not findings from controlled research. What is well supported is more modest: calm, steady, predictable sound that you like can help you relax, mask distracting noise and give your attention somewhere to rest. Any of these tones can do that — and so can plenty of others.
Use it for: relaxation, meditation, a calm background while you read or rest, sound exploration, or simply because you like it. Don't use it as: a treatment for any medical or mental-health condition. For a deeper look at the whole set, see the solfeggio frequency list.
It is the frequency of the note A in "A=432" tuning, an alternative to the standard A=440. Music tuned to 432 Hz is about a third of a semitone lower than standard pitch.
Some people prefer how it sounds, which is a matter of taste. A small 2019 pilot study reported slightly lower heart rate with 432 Hz-tuned music, but there is no strong evidence that 432 Hz is healthier or more "natural" than 440 Hz.
Verdi is said to have favoured a lower pitch standard than those of his time, so A=432 is often linked to his name, though the historical record is debated.
Yes. Choose Pure tone, press Play and tune your A string or reference note to the 432 Hz tone.
No. 432 Hz comes from the A=432 tuning movement. The solfeggio set is 174, 285, 396, 417, 528, 639, 741, 852 and 963 Hz.