E4
Reviewed for accuracy · Maintained by Justin Evans
E4 highlighted — use the view toggle to see all 88 keys.
Piano key
44 of 88
Octave
4
Frequency
329.63 Hz
MIDI number
64
Key color
White key
Pitch class
E · Fb · D##
What is E4?
E4 is the E in octave 4 — the 44th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 329.63 Hz. It sits 4 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) within the same octave to reach octave 4, then step to E.
Every octave doubles the frequency: the E one octave up sounds at 659.26 Hz and the one below at 164.82 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: