E0
20.602Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
16
Piano key
—
Octave
0
Frequency
20.602 Hz
Period
48.539 ms
Wavelength
16.6489 m
Pitch class
E
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the Es share one. This note falls outside the 88-key piano, so it has no piano key number.
At other reference pitches
| Reference (A4) | E0 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 20.227 Hz | the alternative-tuning circle |
| 440 Hzstandard | 20.602 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 20.695 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 20.742 Hz | some sharper continental orchestras |
Every row is E0 — only the A4 you tune to changes. A frequency scales straight with the reference: E0 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every E
Chords with E in them
E appears in each of these — see the whole chord grid.