E5
E5 highlighted — use the view toggle to see all 88 keys.
Piano key
56 of 88
Octave
5
Frequency
659.26 Hz
MIDI number
76
Key color
White key
Pitch class
E, Fb, D##
What is E5?
E5 is the E in octave 5 — the 56th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 659.26 Hz. It sits 16 half-steps above middle C (C4).
To find it, locate any group of two black keys: the white key just to their left is a C. Count up from middle C (C4) 1 octave to reach octave 5, then step to E.
Every octave doubles the frequency: the E one octave up sounds at 1318.52 Hz and the one below at 329.63 Hz. The same piano key can be written as E, Fb, D## depending on the musical context — same sound, different spelling.
Nearby notes
Every E on the keyboard: