E7
E7 highlighted — use the view toggle to see all 88 keys.
Piano key
80 of 88
Octave
7
Frequency
2637.02 Hz
MIDI number
100
Key color
White key
Pitch class
E, Fb, D##
What is E7?
E7 is the E in octave 7 — the 80th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 2637.02 Hz. It sits 40 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) 3 octaves to reach octave 7, then step to E.
Every octave doubles the frequency: the E one octave up sounds at 5274.04 Hz and the one below at 1318.51 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: