E2
82.407Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
40
Piano key
20
Octave
2
Frequency
82.407 Hz
Period
12.1349 ms
Wavelength
4.1623 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.
At other reference pitches
| Reference (A4) | E2 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 80.909 Hz | the alternative-tuning circle |
| 440 Hzstandard | 82.407 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 82.781 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 82.969 Hz | some sharper continental orchestras |
Every row is E2 — only the A4 you tune to changes. A frequency scales straight with the reference: E2 at 432 Hz is the 440 Hz value times 432⁄440.
About this note
The lowest open string on a guitar in standard tuning (E-A-D-G-B-E, low to high). Fret and pluck up from here and you have most of what a guitar plays.
Move around
Every E
Chords with E in them
E appears in each of these — see the whole chord grid.