Octave 0 Piano Notes — Frequencies & Keys

3 keys from A0 (27.50 Hz) to B0 (30.87 Hz).

NoteFrequencyMIDIKey
A027.50 Hz211 of 88
A#029.14 Hz222 of 88
B030.87 Hz233 of 88

A4 Reference ·

A440 Guide · Free Piano