D♯2 / E♭2
77.782Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
39
Piano key
19
Octave
2
Frequency
77.782 Hz
Period
12.8564 ms
Wavelength
4.4098 m
Pitch class
D♯
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the D♯s share one. Enharmonic spellings (D♯2 and E♭2) name the same pitch two ways.
At other reference pitches
| Reference (A4) | D♯2 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 76.368 Hz | the alternative-tuning circle |
| 440 Hzstandard | 77.782 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 78.135 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 78.312 Hz | some sharper continental orchestras |
Every row is D♯2 — only the A4 you tune to changes. A frequency scales straight with the reference: D♯2 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every D♯
Chords with D♯ in them
D♯ appears in each of these — see the whole chord grid.