Tuning & intonation · 2 min read
A440, A442, A415 and A432: Tuning Standards Explained
Where A = 440 Hz came from, why many orchestras tune to 442, what baroque pitch is, the truth about 432 Hz, and what it means for wind instruments.
Updated · Tonehole editors
"Concert pitch" means the frequency the A above middle C is tuned to. Today the reference is A4 = 440 Hz, but pitch has always varied by place and era.
A short history#
- Before standardisation, pitch varied enormously — from below 400 Hz to over 460 Hz depending on the city, the organ and the century.
- In 1859 France legislated the diapason normal at A = 435 Hz, which many countries adopted.
- In 1939 an international conference in London recommended A = 440 Hz, and in 1955 (revised 1975) the International Organization for Standardization published it as ISO 16.
Today's practice#
| Standard | Where | Notes |
|---|---|---|
| 440 Hz | International standard; most bands, recording, pop, American orchestras | Default on tuners and in this site |
| 442–443 Hz | Many continental European orchestras | A brighter sound; winds may need shorter barrels or head-joint adjustments |
| 415 Hz | Baroque ensembles | About a semitone below 440 — convenient for historical instruments |
| 430 Hz | Classical-period ensembles | Around Mozart's and Beethoven's time |
| 432 Hz | Alternative / wellness communities | No historical or acoustic evidence that it is "natural" or healthier |
What changes for wind players#
Woodwinds are built to play best near one pitch. Pulling a clarinet barrel or flute head joint far out to reach 440 on a 442 instrument (or the reverse) changes the internal tuning — some notes drift. If you play regularly at 442, consider a slightly shorter barrel. For baroque pitch you need a historical (or specially made) instrument; you can't pull a modern instrument down a semitone.
Set any reference in our tuner and see frequencies for 440, 442, 432 and 415 in the note frequency chart.
Why do some orchestras tune to 442 Hz?#
A slightly higher pitch gives strings and winds a brighter, more brilliant sound, and many European orchestras have kept the tradition. The difference from 440 is about 8 cents.
Is 432 Hz better than 440 Hz?#
There is no scientific evidence that 432 Hz is more natural or beneficial. It is simply about 32 cents lower than 440 Hz.