A4 equals 432 Hz
The A above middle C is the anchor. Every other chromatic target is calculated by equal-tempered semitone spacing from that anchor.
A4 fixed at 432 Hz
Free Online 432 Hz Tuner
Tune any sustained note against equal temperament calibrated to A4 = 432 Hz, with live frequency and cents feedback.
432 Hz reference
Tune chromatically with A4 fixed at 432 Hz
Every note target is calculated from A4 = 432 Hz, so you can tune strings, winds, keys, or voice to the same reference.
Current note
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Frequency
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Deviation
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Reference pitch
432 Hz
No stable note detected yet. Sing or play a sustained single note close to your microphone.
Calibration
This page keeps A4 locked at 432 Hz. Use the Chromatic Tuner if you need an adjustable concert-pitch reference.
Best results
- Use a quiet room and stay close to the microphone.
- Play or sing one sustained note at a time.
- Avoid heavy background chords or reverb while detecting pitch.
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432 Hz pitch history
Watch each note settle around the 432 Hz reference
The note lane and pitch trace show whether a sustained tone remains centered after its attack, breath change, or vibrato.
Pitch piano roll
A note-lane view of the last 15 seconds, with stable notes as blocks and live pitch drift as a trace.
Auto-follow range
Reference explained
What changes when A4 moves from 440 to 432 Hz
The note names and intervals stay the same; the frequency assigned to every note moves slightly lower.
About 31.8 cents lower
A 432 Hz reference is about 31.8 cents below A4 = 440 Hz, so an instrument tuned to 440 will read sharp on this page.
Use one reference together
Everyone in an ensemble must use the same reference. Mixing 432 Hz and 440 Hz tuning creates audible beating and pitch conflict.
Tuning workflow
How to tune to 432 Hz
Keep this page open as the shared reference and tune one sustained note at a time.
- 1
Confirm that the session or recording is intended to use A4 = 432 Hz.
- 2
Start listening and play one clear note without chords or background audio.
- 3
Adjust the instrument until the correct note and octave approach 0 cents.
- 4
Recheck every note or string after the instrument's tension and temperature settle.
432 Hz FAQ
Common questions about the 432 Hz reference
432 Hz changes the tuning reference, not the names or interval pattern of the notes.
What does 432 Hz tuning mean?
It means the A above middle C, called A4, is tuned to 432 cycles per second. The other notes are calculated from that anchor.
Is 432 Hz a whole semitone below 440 Hz?
No. It is about 31.8 cents lower, which is less than one third of a semitone. The note names remain unchanged.
Can one musician use 432 Hz while the band uses 440 Hz?
Not if they need to play in tune together. The whole ensemble or backing track should use the same reference pitch.
Compare references
Choose the tuning workflow you need
Use an adjustable chromatic reference, standard guitar targets, or the broader pitch analysis page.