C7
2,093.005Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
96
Piano key
76
Octave
7
Frequency
2,093.005 Hz
Period
0.4778 ms
Wavelength
0.1639 m
Pitch class
C
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the Cs share one.
The octave-numbering trap: this site uses scientific pitch notation, where MIDI 96 is C7. Yamaha gear labels the same key C6 and some trackers call it C8. The MIDI number never moves — only the octave name printed on the box does.
At other reference pitches
| Reference (A4) | C7 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 2,054.95 Hz | the alternative-tuning circle |
| 440 Hzstandard | 2,093.005 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 2,102.518 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 2,107.275 Hz | some sharper continental orchestras |
Every row is C7 — only the A4 you tune to changes. A frequency scales straight with the reference: C7 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every C
Chords with C in them
C appears in each of these — see the whole chord grid.