E-1
10.301Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
4
Piano key
—
Octave
-1
Frequency
10.301 Hz
Period
97.078 ms
Wavelength
33.2977 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) | E-1 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 10.114 Hz | the alternative-tuning circle |
| 440 Hzstandard | 10.301 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 10.348 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 10.371 Hz | some sharper continental orchestras |
Every row is E-1 — only the A4 you tune to changes. A frequency scales straight with the reference: E-1 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.