432 Hz Music: What the Evidence Says (and Doesn't)

Q: Is 432 Hz real or a myth?

432 Hz is real as a tuning. It means setting the note A to 432 vibrations a second instead of 440. The myth is the rest. There's no good evidence that 432 Hz is the natural frequency of anything, and the small head-to-head trials give mixed results on whether it does anything different from standard tuning.

Q: Does 432 Hz music heal?

No trial we found shows that 432 Hz music heals anything. "Healing" is a marketing word here. The small studies measured short-term changes in heart rate, breathing rate, blood pressure or questionnaire scores, and people often felt better with either tuning.

Q: What is the healthiest Hz to listen to?

No study we found shows a healthiest Hz to listen to. On volume, NHS hearing-loss advice is to keep music just high enough to hear comfortably.

Q: Is 432 Hz better for meditation?

We found no study that tested 432 Hz during meditation, so there's no evidence it's better for it. If it helps you settle, it's a fine choice; if it doesn't, nothing is lost by using standard tuning. This is general information, not medical advice. NSDR is not a treatment for any condition. If you're struggling, talk to your GP. UK: Samaritans 116 123. US: 988.

432 Hz music is ordinary music tuned so that the note A sits at 432 vibrations a second instead of the standard 440. Fans say that makes it more natural and calming, even healing. The research is small. About a dozen studies have tested people listening to 432 Hz music. Only a handful compared it directly with a standard pitch, and their results point in different directions. No study we found shows it heals anything. If you like how it sounds, use it. In the trials, people often felt better with either tuning, so the music you enjoy and the break you take seem to matter more than the pitch.

What is 432 Hz?

Musicians tune to a reference note. Today's standard, ISO 16, sets the A above middle C at 440 Hz (440 vibrations a second). "432 Hz music" retunes that A to 432, and every other note moves down with it by the same ratio. The melody and the instruments stay the same.

The gap is small. In musical terms it's about 32 cents:

1,200 × log2(440 ÷ 432) ≈ 31.8 cents

A semitone is 100 cents, so 432 Hz tuning is a bit under a third of a semitone flat of standard pitch. In frequency terms, 432 is 1.8% lower than 440. In the double-blind trials below, listeners weren't told which tuning they were hearing.

Where the 432 Hz claim comes from

The 440 standard is less than a century old as an international agreement. A project by Fanny Gribenski at the Max Planck Institute for the History of Science describes how A = 440 Hz became the agreed standard at an international conference in 1939, after decades of negotiation between performers, composers, instrument makers, physicists and state ministries. ISO wrote it into a formal standard in 1975 and last confirmed it in 2022. The project calls the result a product of "competing views and interests". Practice still varies. One of the trials below notes that 443 Hz is the concert pitch in German professional orchestras.

So 440 isn't sacred. That doesn't make 432 special either. Some promotional pages call 432 Hz "the natural frequency of the universe", say it resonates with the Earth's electromagnetic field, or point to balanced patterns in water. Those are claims, not findings. When the first trial we found comparing 432 Hz with 440 Hz music was published in 2019, its authors wrote that no scientific studies supported the claim that 432 Hz tuning has better effects on the human body.

What do the studies say?

A PubMed search on 19 October 2026 finds 18 records on 432 Hz music. About a dozen are studies of people listening to it, and the biggest had 162 participants. Three trials in adults compared 432 Hz with a standard concert pitch (440 Hz, or 443 Hz in one) head to head, which is the comparison that tests the tuning itself. (We left out four more that didn't confirm all their participants were adults. Their results went both ways too.)

Study	Who	What they did	What they found	Caveat
Calamassi et al. 2020	12 adults with spinal cord injuries	Favourite music, 30 minutes a day, a period at each tuning	Sleep scores rose after the 432 Hz period (+3.6) and not after the 440 Hz period (−1.5)	Tiny; two separate before-and-after changes, not a direct test of 432 against 440; listening times and wash-out periods varied
Calamassi et al. 2022	54 emergency healthcare workers, aged 25 to 63 (83 breaks; some people took part more than once)	Work breaks with 440 Hz music, 432 Hz music or an ordinary break with no music	Anxiety fell in all three groups, including the no-music break; breathing rate (−2.7 a minute) and systolic blood pressure (−3.8 mmHg) fell in the 432 group	Changes were measured within each group, before and after a break
Hohneck et al. 2025	43 adults with cancer, aged 35 to 86	Two 15-minute sessions with a body monochord, one at 432 and one at 443 Hz, in random order	Heart rate fell after both, more with 432 (median 3 vs 1 beat a minute, p = 0.04); pulse wave velocity, a blood-vessel measure, fell with 432 and differed from 443 (p < 0.001); heart rate variability, vascular resistance and stiffness did not differ significantly between tunings; mood scores improved with both	Not recorded music; compared 432 with 443 Hz; most patients weren't anxious to begin with

Two of the three come from one Italian research group; one co-author on both is an independent musician and sound engineer, and both papers declare no conflicts of interest. The largest had 54 people. The effects that favour 432 are small changes in heart rate, breathing rate or questionnaire scores, measured soon after listening, and in two of the three trials the changes were measured within each tuning's own period or group, not tested head to head.

Other trials tested 432 Hz music against no intervention, white noise, binaural beats or aromatherapy, mostly in people having dental work. In two of them, anxiety fell with 432 Hz music and with binaural beats, and neither beat the other. In a third, with 72 adults having a root canal, 432-tuned music didn't significantly change blood pressure or heart rate compared with the control group. With no standard-tuning group, none of these can tell you whether the tuning mattered.

We found no head-to-head trial with more than 54 people, and the results don't agree.

Is 432 Hz better than 440 Hz for relaxing?

Not on current evidence. In the three trials above, 432 Hz came out slightly ahead on some measures: heart rate and a blood-vessel measure in the cancer trial, breathing rate and systolic blood pressure after a break in the emergency-worker trial, and sleep scores in the spinal-injury trial. The other measures mostly showed no clear difference. We found no independent repeat of any of these results.

The clearer pattern is that people often felt better with either tuning, or after an ordinary break with no music. In the 2022 trial, anxiety dropped in the no-music break too, where people did their routine break activities, such as talking to colleagues or using their phones. In the cancer trial, mood scores rose after both sessions. The most consistent finding is that a break went with feeling better, whether or not there was music, and at either tuning.

If 432 Hz music relaxes you, keep using it. Enjoying the sound is a good reason to listen. Just don't pay extra for the tuning.

432 Hz and 528 Hz: what about the other "healing frequencies"?

432 Hz is often sold alongside 528 Hz and the other "solfeggio frequencies", each with its own "healing" claim. On PubMed, "solfeggio" mostly turns up music-teaching papers, plus one study in zebrafish. Searching "528 Hz" with music or sound gives seven records: two animal studies, a review and four human studies (searched 19 October 2026). The biggest, with 162 students, found that 528 Hz music raised two saliva markers (BDNF and CREB) compared with no music, that 432 Hz music raised a third (GRP78), and no difference in a thinking test. A 2026 trial of 100 adults found lower anxiety scores after four weeks of sound-meditation sessions built on 528 Hz audio, singing bowls and gongs than after music sessions; because of the bowls and gongs, the tone itself wasn't tested. We'll cover solfeggio frequencies in a separate guide.

Does 432 Hz help you sleep?

There are two small sleep studies. In the spinal-injury trial above, 12 hospital patients' sleep scores rose after a period of 432 Hz music and not after 440. In a separate lab study, 15 men who were slow to fall asleep took a daytime nap with and without 432 Hz music. The time it took them to drop off didn't change significantly, though alpha-wave activity rose (p < 0.01), which the authors read as a calming effect.

Music in general has better evidence. A 2022 Cochrane review included 13 trials with 1,007 adults who had trouble sleeping. Listening to music for 25 to 60 minutes a day improved how well people rated their sleep (moderate-certainty evidence), though the few studies that measured sleep objectively found little change. The review was about listening to music, not about any tuning. If you'd rather fall asleep to steady sound than to music, our sleep sounds guide compares the options.

For ongoing sleep problems, CBT-I (cognitive behavioural therapy for insomnia) is the recommended first treatment. Ask your GP.

How to choose calming music

Pick music you like. In the trials, people felt better at either tuning, and the spinal-injury trial let people choose their favourite music.
Keep it quiet. NHS hearing-loss advice, written for people who already have hearing loss, is not to listen to music too loudly, with the volume just high enough to hear comfortably. The same page lists "aging or damage from loud noise over many years" among the causes of gradual hearing loss, so low volume is a sensible habit for any track.
Set a timer if you're listening in bed, so it doesn't play all night.
Don't buy a frequency. No tuning has been reliably shown to work better for relaxation.

The short version: pick music you like, keep it quiet, and don't worry about the tuning. If you're curious about the brainwave claims made for binaural beats, our piece on alpha waves and studying looks at what that research shows. For ways to unwind that don't depend on sound, see how to relax.

FAQ

Is 432 Hz real or a myth?

432 Hz is real as a tuning. It means setting the note A to 432 vibrations a second instead of 440. The myth is the rest. There's no good evidence that 432 Hz is the natural frequency of anything, and the small head-to-head trials give mixed results on whether it does anything different from standard tuning.

Does 432 Hz music heal?