NUMBER OF KEYS AND OCTAVES OF THE KEYBOARDS

Here we list the number of keys and octaves of the most common keyboards on the market.

In this table, we will refer to C4 as middle C. This is the standard scientific pitch notation, but it's not uncommon to see it labelled as C3 in software/MIDI environments, or even C5 in programs like FL Studio.

In the equal temperament system, its frequency is: 261.6 Hz.

Number of Keys	Number of Octaves	Starting Note	Ending Note
88	7 + 1/4	A0	C8
76	6 + 1/3	E0 (C0, F0)	G7 (B7, A7)
61	5	C1 (F1)	C6 (G6)
49	4	C2 (F2)	C6 (C5)
37	3	C3 (F3)	C6 (C4)
25	2	C3 (F4)	C5 (C5)