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432 Hz Converter

Retune any song from standard A = 440 Hz to A = 432 Hz with an exact −31.77 cent pitch shift, or pick 444 Hz, C = 528 Hz, Baroque 415 Hz or any custom reference. Compare the original and the retuned version, then download MP3 or WAV. Everything runs on your device.

Last updated:

−31.77 cents · ratio 0.98182

How to retune
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How to use the 432 Hz Converter

  1. Check the tuning: Original is 440 Hz for almost all modern recordings; New is 432 Hz by default, or pick a preset.
  2. Choose the mode: Keep tempo changes only the pitch; Change speed too slows the song slightly, like a turntable, with no processing artifacts.
  3. Add a song by dropping it on the box or clicking to choose a file (or try the 440 Hz sample tune).
  4. Press Play preview and switch between Retuned and Original to hear the difference.
  5. Download the retuned audio as MP3 or WAV.

The math behind 440 Hz to 432 Hz

Retuning multiplies every frequency in the recording by the same factor: ratio = new A4 ÷ old A4. For 440 → 432 Hz that is 432 / 440 = 0.981818. In musical terms the shift in cents is 1200 × log2(ratio) = −31.77 cents, roughly a third of a semitone. Because the whole song moves together, the key, the chords and the intervals between notes stay exactly the same; only the reference pitch changes.

NoteA4 = 440 HzA4 = 432 Hz
A1 (low A on a bass)55.00 Hz54.00 Hz
C4 (middle C)261.63 Hz256.87 Hz
D4293.66 Hz288.33 Hz
E4329.63 Hz323.63 Hz
F4349.23 Hz342.88 Hz
G4392.00 Hz384.87 Hz
A4440.00 Hz432.00 Hz
B4493.88 Hz484.90 Hz
C5523.25 Hz513.74 Hz

Values use 12-tone equal temperament: f = A4 × 2(n − 69)/12, where n is the MIDI note number.

Common reference pitches

ReferenceA4Shift from 440 HzWhere it is used
Modern standard (ISO 16)440 Hz0 centsAlmost all pop, rock and film music
Orchestral "bright" tuning442–444 Hz+7.85 to +15.67 centsMany European orchestras
C5 = 528 Hz443.99 Hz+15.64 cents"528 Hz" music, equal temperament
French diapason normal (1859)435 Hz−19.79 cents19th-century French standard
A = 432 Hz ("Verdi tuning")432 Hz−31.77 centsAlternative tuning favored by some listeners
Scientific pitch (C4 = 256 Hz)430.54 Hz−37.63 centsPhysics and acoustics texts
Baroque pitch415 Hz−101.27 centsPeriod-instrument ensembles (about a semitone down)

Which mode should I use?

  • Keep tempo stretches the audio with WSOLA (overlapping 46 ms slices aligned by waveform similarity) and then resamples it with a windowed-sinc filter. The song keeps its exact length and BPM, which matters for DJ sets, videos and play-along.
  • Change speed too just resamples, like playing a record slightly slower. A 432 Hz conversion makes the song 1.85% longer and is completely free of stretching artifacts, so it is the purest option for listening.
  • Check by ear: play the A4 reference tone while listening to a sustained A in the retuned song; with a correct source reference they should match without beating.
  • Know your source: if a recording was made at 442 Hz, enter 442 as the original tuning so the result lands exactly on 432 Hz.

Frequently asked questions

How many cents is 440 Hz to 432 Hz?

The shift is 1200 × log2(432 / 440) = −31.77 cents, about one third of a semitone down. Every frequency in the song is multiplied by 432/440 = 0.98182, so A4 moves from 440 Hz to 432 Hz and middle C from 261.63 Hz to 256.87 Hz.

Does converting to 432 Hz change the tempo?

Not in Keep tempo mode: the audio is time-stretched first and then resampled, so the length stays the same and only the pitch moves. In Change speed too mode the song simply plays 1.85% slower (a 3:00 song becomes about 3:03.3), which avoids any time-stretch artifacts.

What is the 528 Hz preset?

It retunes the song so that the note C5 lands exactly on 528 Hz. In equal temperament C5 is three semitones above A4, so this corresponds to A4 = 528 / 2^(3/12) ≈ 443.99 Hz, a shift of about +15.64 cents from 440 Hz.

Is 432 Hz music proven to be healthier or more relaxing?

No. There is no solid scientific evidence that A = 432 Hz has special healing or relaxing effects; small studies are inconclusive. The audible difference is a slightly lower, sometimes warmer-sounding pitch. Many people simply prefer it, and it is also useful to play along with instruments tuned to 432 Hz.

What if my song is not tuned to exactly 440 Hz?

Enter its real reference in Original tuning, for example 442 Hz for many European orchestral recordings or 415 Hz for Baroque ensembles. The tool shifts by the ratio between the two values, so the result lands exactly on your new reference.

Will the audio quality get worse?

A shift of around 30 cents is small, so the result sounds natural on most music. Keep tempo mode can add very slight smearing on sharp drum hits; Change speed too mode has none. WAV export avoids any extra compression; MP3 at 320 kbps is near-transparent.

Why does MP3 export not work?

The MP3 encoder is a small library that loads the first time you export MP3. If it cannot be downloaded (offline or behind a strict firewall), choose WAV, which is written directly in your browser.

Are all the tools on FreeToolCabin tested for quality and accuracy?

Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.

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