A3 frequency
In standard tuning (A4 = 440 Hz), A3 is 220.00 Hz. It's MIDI note 57 and key 37 of 88 on a piano.
| Frequency | 220.00 Hz |
| Period | 4.545 ms |
| Wavelength in air | 1.56 m |
| One octave down | A2 · 110.00 Hz |
| One octave up | A4 · 440.00 Hz |
| At A4 = 432 Hz | 216.00 Hz |
A3 is within the usual range of piano, guitar, bass guitar, violin, viola, cello, trumpet, a bass voice, a tenor voice and an alto voice.
See every note on the note frequency chart, or train your ear to recognise notes like this one in the course.
Questions
What is the frequency of A3?
220.00 Hz in standard tuning, where A4 is 440 Hz.
What is A3 at 432 Hz tuning?
If A4 is tuned to 432 Hz, A3 becomes 216.00 Hz.
Which octave is A3 in?
Octave 3. Octaves are numbered from C, so A3 sits below middle C (C4).
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