432 Hz: Listen, Compare With 440 Hz and Check the Claims

By the Awaken Library Editorial TeamEditorial Team · Updated October 23, 2026Oct 23, 2026 · How we write

432 Hz is a tuning pitch: the note A set to 432 vibrations per second instead of the standard 440, about a third of a semitone lower. Fans call it warmer and calmer; the studies behind that are small. Press Play and compare.

What is 432 Hz?

A frequency in hertz (Hz) is the number of vibrations per second. A string or a speaker cone that moves back and forth 432 times a second gives a tone near the A above middle C. Since 1939 that note has been tuned to 440 Hz by international agreement; “432 Hz” means tuning it slightly lower and moving every other note down with it.

So the phrase covers two different things. One is a single pure tone at 432 Hz, which is what the player above makes. The other is “432 Hz music”: ordinary songs or meditation tracks whose whole tuning has been lowered. Most claims online are about the second, and most of them blend in the first.

432 Hz vs 440 Hz: what is the difference?

The difference is 31.8 cents, about a third of a semitone, or 1.8% in frequency. A trained musician hears it at once when the two tones play side by side: together they make a slow wobble, 8 beats a second, which is the beat you can hear in the 432 ↔ 440 switch if you press it while the tone is playing. Heard on its own, an hour apart, most people cannot tell which one they are hearing, because few people have absolute pitch.

Is 432 “more natural”? Physics doesn’t prefer either number. A hertz is a second divided by a count, and the second itself is a human unit, set by an atomic clock since 1967. A tuning that sounds natural is the one your ear grew up with, which for most people today is 440. Before standardization, pitch wandered a lot: French tuning forks of the time give A = 423 Hz (Paris Opera, 1810), 432 Hz (1822) and 449 Hz (1855).

What people describe as the difference, “warmer”, “softer”, “less sharp”, is real in the sense that a lower pitch is lower. The blind test in the player lets you check whether you can hear calm in it without knowing which tone is which.

How to tune a guitar to 432 Hz

Most clip-on and app tuners have a reference setting, usually shown as “A4 = 440Hz” or “Cal 440”. Change it to 432 and tune the strings as usual; every string ends up 31.8 cents lower, about a third of a semitone. If your guitar tuner has no such setting, tune normally and then lower each string until it reads about 32 cents flat. You need no capo and no new strings: they simply sit a little looser. Other instruments work the same way if their pitch can be adjusted; an acoustic piano needs a technician, and a digital piano usually has a “master tune” setting in its menu.

432 Hz benefits: what the studies found

We searched PubMed in October 2026 for studies that compared music at 432 Hz with the same music at 440 Hz. There are a handful, all small. Here is what each found, with its size.

So does 432 Hz calm you? Read together, the studies say that listening to calm music lowers anxiety in stressful moments, and that 432 does at least as well as 440. Whether 432 does better is not settled: the few comparisons are small, mostly from a single research group, and the strongest result sits exactly at p = 0.05. Calm’s blog, one of the top pages for this search, lists seven benefits; our reading of the same studies supports one, “music can help you relax”, and it is not specific to 432.

Using it at bedtime. The only sleep study is a pilot with 12 patients, so there is no proof either way. If a quiet sound helps you settle, that is reason enough: pick 432 in the player, set the volume low, choose the 20-minute timer and put the phone face down. A bare tone can feel thin after a while; if it does, a 432 Hz music playlist at the same low volume is the same idea with more to listen to.

Pure tone or 432 Hz music?

A pure tone is one sine wave with no overtones. It sounds like a tuning fork or an old test signal: clean, a little flat, and tiring after a while if it is loud. Musical instruments add many overtones on top of the main frequency, which is why a piano A and a flute A at the same 440 Hz sound different.

Music “in 432” is simply music tuned 31.8 cents lower. You can do it yourself: lower the pitch by that many cents in any audio editor without changing the speed. Many 432 tracks on YouTube were made exactly that way from 440 recordings.

That is why we offer a pure tone here rather than music: it lets you hear the frequency itself, with nothing else changing. If a song feels calmer to you at 432, try it at 440 the same evening at the same volume. The calm usually comes from the song and the setting you listen in.

Where 432 Hz comes from: Sauveur, Verdi, 1939 and a 1988 campaign

The history is short and well documented, and it does not reach back to Egypt or Tibet.

Did the Nazis choose 440 Hz? No, though the story is everywhere. The meeting that settled 440 Hz was held in London in 1939, Germany was one of five countries at the table, American instrument makers had used 440 since the 1920s, and the standard was confirmed twice after the war by ISO. The historian Fanny Gribenski, who traced the whole process from 1859 to 1955 in Tuning the World (2023), describes it as decades of negotiation between engineers, musicians and governments, with the American 440 winning out over the French 435. She calls the 5 Hz gap between 435 and 440 “almost negligible” to the ear.

Is the “math of 432” real?

Sites list numerical reasons why 432 is special. They are easy to check:

• “Its digits add up to 9.” True, and so do those of 441, 450 and 1,233. Digit sums depend on writing numbers in base ten, which has nothing to do with sound. All four are multiples of nine; The Number Atlas covers the digit rule for multiples of nine and how numerology uses it.
• “It matches the Earth’s Schumann resonance, 8 Hz.” The Schumann resonance is an electromagnetic resonance of the gap between the ground and the ionosphere, about 7.83 Hz, not a sound. The usual link runs through C = 256, which is 8 × 32. But 8 is 7.83 rounded up, and 7.83 × 32 is 250.6, not 256; halving 432 six times gives 6.75.
• “432 is linked to the golden ratio.” 432 divided by 1.618 is 267, which is not a note in either tuning. We found no version of this claim that survives a calculator.
• “C = 256 makes every C a power of two.” True, and that is Sauveur’s 1713 idea. It gives A ≈ 430.5 Hz in equal temperament, not 432. The 432 figure needs Pythagorean tuning to fit.

So 432 is an ordinary choice: a pitch a little below standard, which some ensembles and listeners prefer.

Solfeggio frequencies: list, notes and where they come from

The solfeggio frequencies are a list of nine tones, from 174 to 963 Hz, sold as an ancient sacred scale. The name is borrowed from solfège, the do-re-mi syllables. The numbers are modern.

What is old: a Latin hymn to John the Baptist, Ut queant laxis, traditionally credited to Paul the Deacon in the 8th century. Each of its first six half-lines starts one step higher, on the syllables ut, re, mi, fa, sol, la, and in the 11th century the monk Guido of Arezzo used them to teach singers to read music. These syllables name steps of a scale relative to each other. They had no fixed pitch, and in Guido’s time nobody could measure one; the first measurement of a tone’s frequency dates from 1636.

What is new: the six numbers 396, 417, 528, 639, 741 and 852 appear first in Healing Codes for the Biological Apocalypse (1999) by Leonard Horowitz and Joseph Puleo. Puleo describes getting them by adding the digits of verse numbers in the Book of Numbers, chapter 7, a numerological method. Three more, 174, 285 and 963, were added by later authors. The healing labels came with the book and later videos; no study tested them before they spread.

The note column is our own calculation: several of the “ancient scale” tones fall almost halfway between two piano keys (639 Hz is 46 cents off its nearest note), so played together they do not form a scale in any tuning system. You can hear four of them, 396, 528, 639 and 741 Hz, in the player above, or type any other number into it.

Do solfeggio frequencies work? As tones to relax to, the same way any quiet sound can help, yes for some people. As specific remedies (guilt at 396, relationships at 639, detox at 741), there is no study; a PubMed search in October 2026 found none. Our solfeggio frequencies page plays all nine tones next to a real do-re-mi scale.

528 Hz: the “love frequency” and the DNA repair claim

528 Hz is the third solfeggio number, assigned to the syllable MI and promoted as the “miracle tone”. It sits 16 cents above C5, the C an octave above middle C. The claim that it repairs DNA comes from Horowitz’s own books, not from biology research. We found no peer-reviewed study showing that a 528 Hz sound repairs DNA in people or cells.

What does exist: a Japanese study of 9 people (Akimoto and colleagues, 2018) who listened to piano music at 528 or 440 Hz for five minutes; saliva cortisol fell after the 528 session, and the authors note the small sample. A 2026 trial with 162 students found changes in saliva markers after 20 minutes of 528 music, without any effect on test performance. There are also rat and zebrafish studies. None of this is about DNA, and none is large enough to say 528 is special. The 528 Hz page goes through each study and the note 528 really is.

Searches like “528 Hz for tinnitus” and “is 528 Hz dangerous” come up often. A tone at a gentle volume is not dangerous. It also does not treat tinnitus. Sound therapy is one of the real options the NIH lists for tinnitus, and it is chosen with an audiologist or an ENT doctor; a 528 Hz track from a playlist is a different thing.

Chakra frequencies

Charts that give each chakra a number (396 Hz for the root, 528 for the solar plexus, 639 for the heart, 741 for the throat) combine two modern systems: the Western chakra chart of the 20th century and the 1999 solfeggio list. The 16th-century Sanskrit text that describes the six centers gives each a seed syllable such as LAM or YAM, not a frequency. Our guide to the seven chakras separates the old text from the later additions and answers the frequency question for each center.

How to listen safely

• Volume. The player starts at -24 dB below full scale, which is quiet on most phones. The WHO advises keeping personal devices below 60% of maximum; at an average of 80 dB you can listen up to 40 hours a week, and the safe time drops fast above that. A pure tone is more tiring than music at the same loudness, so keep it lower than you would keep a song.
• Ringing ears. If you have tinnitus, a steady tone can make it more noticeable for some people and less for others. Stop if it gets worse, and see an audiologist or an ENT doctor for real sound therapy.
• Epilepsy. Seizures set off by sound or music exist but are rare. If you have epilepsy, ask your doctor before using binaural or beating tones, and do not combine them with flashing visuals.
• Driving. Do not use binaural mode while driving or doing anything that needs your full attention.
• Medical care. If you are using tones to cope with anxiety, insomnia or pain that has lasted weeks, that deserves a doctor’s visit. Sound can help you relax; it does not treat the cause.

What this page does not promise. We do not claim that 432 Hz, 528 Hz or any solfeggio tone heals, repairs DNA, opens chakras or raises your vibration. The research above is small and says only that calm listening can lower stress for a while, with no clear advantage for any one number. The player makes a tone; it doesn’t measure anything about you. If you like how 432 sounds, that is a perfectly good reason to listen to it.

How the player and the blind test work

The player uses the Web Audio API built into your browser: an oscillator makes a sine wave at the chosen frequency, and a volume control sits after it. The tone starts and stops with a fade of about a second, so there is no click. When you switch from one tone to another while it plays, the new tone fades in as the old one fades out. In binaural mode the left ear gets the chosen frequency and the right ear that frequency plus 4, 6, 8 or 10 Hz. The timer fades the tone out at the end and keeps working if you switch to another tab. Nothing is recorded, downloaded or sent anywhere.

The blind test plays 8 pairs. In each pair the order of 432 and 440 is random, so you cannot learn it. If you were only guessing, picking 432 as calmer in at least 7 of 8 rounds would happen 4% of the time, and at least 6 of 8 14% of the time. The page shows that chance next to your score, so you can see whether your result means anything.

One limit of the test: 432 is always the lower tone of the pair, so a person who simply finds lower tones calmer will pick it every time. The test shows whether you hear a difference in calm, not whether that difference is about the number 432. To check, try any two other tones 31.8 cents apart with the “your own frequency” field, for example 486 and 495 Hz (the same 440 : 432 ratio, one step higher).

The note names and cents on this page are calculated from A = 440 Hz in equal temperament when the page is built, with the same code the player uses.

Related: mudras (hand positions for meditation) · kundalini in the old texts and today · chakra meditation with a timer