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396 Hz
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The first tone of the original solfeggio six, "Ut" — play it as a pure tone or a soft drone.
Start at a low volume and turn up slowly. Pure tones can sound louder than music at the same setting, especially higher frequencies.
| Frequency | 396 Hz (396 vibrations per second) |
|---|---|
| Nearest musical note (A=440) | G4 +18 cents |
| Wavelength in air | about 87 cm |
| Period of one cycle | 2.53 ms |
| Solfeggio syllable | Ut |
| Which set | Original six (Puleo) |
| Popular claim | Promoted as "liberating guilt and fear"; often mapped to the root chakra (a claim, not a demonstrated effect) |
The solfeggio syllables come from Ut queant laxis, a Latin hymn to St John the Baptist. Around 1025 the music teacher Guido of Arezzo noticed that each line of the hymn began one step higher than the last, and used the first syllable of each line — Ut, Re, Mi, Fa, Sol, La — to teach singers to find their notes. "Ut" later became "Do".
That system named relative steps of a scale. It never assigned frequencies in Hertz: absolute pitch standards did not exist for centuries afterwards. The link between "Ut" and 396 Hz was made in the 1970s by Joseph Puleo, who said he derived the numbers by applying digit-reduction numerology to verse numbers in the Book of Numbers, and it was popularised by Leonard Horowitz's 1999 book Healing Codes for the Biological Apocalypse.
Horowitz associated each syllable with a phrase from the hymn. 396 Hz is promoted as the tone for "liberating guilt and fear" and, in later chakra-based playlists, for the root chakra. Both are modern interpretations: the chakra-to-frequency mapping is a recent Western invention, not something found in Indian tradition, and no study has shown that 396 Hz reduces fear or guilt.
Some people do find that a steady, mid-register tone gives a useful focus for a letting-go or release practice — a journaling session, a breath practice, a few minutes of quiet before bed. That is a perfectly good reason to use it, as long as it is not mistaken for therapy.
396 Hz is a slightly sharp G: G4 is 392 Hz in standard tuning, so 396 Hz sits about 18 cents above it. Its digits add to 18, and 1 + 8 = 9 — one of the 3-6-9 patterns that run through the whole set.
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.
Because solfeggio promoters attached the first syllable of the medieval hymn Ut queant laxis to it. The hymn itself never specified 396 Hz or any other frequency — that link was made in the 1970s.
There is no evidence that it does. That description comes from solfeggio literature. A tone can be a calm backdrop for reflective practice, but it is not a treatment for anxiety or guilt.
It is close to G4 (392 Hz in standard tuning) — about 18 cents sharp.
Many playlists label it that way, but the pairing of chakras with specific frequencies is a modern idea, not part of traditional yogic texts.