The A Note
A is a white key on the piano. It sounds at 440 Hz in octave 4.
A on the piano
Key facts
- On the keyboard
- a white key on the piano.
- Frequency (octave 4)
- 440 Hz
- MIDI number (octave 4)
- 69
- In key signatures
- Never appears as an accidental in a key signature.
A frequency in every octave
Frequencies for A in scientific pitch notation, with A4 tuned to 440 Hz.
| Note | MIDI | Frequency |
|---|---|---|
| A1 | 33 | 55 Hz |
| A2 | 45 | 110 Hz |
| A3 | 57 | 220 Hz |
| A4 | 69 | 440 Hz |
| A5 | 81 | 880 Hz |
| A6 | 93 | 1760 Hz |
| A7 | 105 | 3520 Hz |
Chords on A
The most common chords built with A as the root.
Scales starting on A
Keys and scales that use A as their tonic.
All notes
Frequently asked questions
Where is A on the piano?
A is a white key on the piano.
What frequency is A4?
A4 sounds at 440 Hz with A4 tuned to 440 Hz.
