D7
2,349.318Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
98
Piano key
78
Octave
7
Frequency
2,349.318 Hz
Period
0.4257 ms
Wavelength
0.146 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 Ds share one.
At other reference pitches
| Reference (A4) | D7 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 2,306.603 Hz | the alternative-tuning circle |
| 440 Hzstandard | 2,349.318 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 2,359.997 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 2,365.336 Hz | some sharper continental orchestras |
Every row is D7 — only the A4 you tune to changes. A frequency scales straight with the reference: D7 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.