E4
329.628Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
64
Piano key
44
Octave
4
Frequency
329.628 Hz
Period
3.0337 ms
Wavelength
1.0406 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) | E4 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 323.634 Hz | the alternative-tuning circle |
| 440 Hzstandard | 329.628 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 331.126 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 331.875 Hz | some sharper continental orchestras |
Every row is E4 — only the A4 you tune to changes. A frequency scales straight with the reference: E4 at 432 Hz is the 440 Hz value times 432⁄440.
About this note
The highest open string on a guitar in standard tuning — the thin "high E" two octaves above the lowest string.
Move around
Every E
Chords with E in them
E appears in each of these — see the whole chord grid.