D♯3 / E♭3
155.563Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
51
Piano key
31
Octave
3
Frequency
155.563 Hz
Period
6.4283 ms
Wavelength
2.2049 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♯3 and E♭3) name the same pitch two ways.
At other reference pitches
| Reference (A4) | D♯3 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 152.735 Hz | the alternative-tuning circle |
| 440 Hzstandard | 155.563 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 156.271 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 156.624 Hz | some sharper continental orchestras |
Every row is D♯3 — only the A4 you tune to changes. A frequency scales straight with the reference: D♯3 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.