B7
3,951.066Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
107
Piano key
87
Octave
7
Frequency
3,951.066 Hz
Period
0.2531 ms
Wavelength
0.0868 m
Pitch class
B
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the Bs share one.
At other reference pitches
| Reference (A4) | B7 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 3,879.229 Hz | the alternative-tuning circle |
| 440 Hzstandard | 3,951.066 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 3,969.026 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 3,978.005 Hz | some sharper continental orchestras |
Every row is B7 — only the A4 you tune to changes. A frequency scales straight with the reference: B7 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every B
Chords with B in them
B appears in each of these — see the whole chord grid.