E1
E1 highlighted — use the view toggle to see all 88 keys.
Piano key
8 of 88
Octave
1
Frequency
41.2 Hz
MIDI number
28
Key color
White key
Pitch class
E, Fb, D##
What is E1?
E1 is the E in octave 1 — the 8th key of the 88 on a full-size piano, counted from the bottom. In standard tuning it sounds at 41.2 Hz. It sits 32 half-steps below middle C (C4).
To find it, locate any group of two black keys: the white key just to their left is a C. Count down from middle C (C4) 3 octaves to reach octave 1, then step to E.
Every octave doubles the frequency: the E one octave up sounds at 82.4 Hz and the one below at 20.6 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: