B-1
15.434Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
11
Piano key
—
Octave
-1
Frequency
15.434 Hz
Period
64.792 ms
Wavelength
22.2237 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. This note falls outside the 88-key piano, so it has no piano key number.
At other reference pitches
| Reference (A4) | B-1 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 15.153 Hz | the alternative-tuning circle |
| 440 Hzstandard | 15.434 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 15.504 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 15.539 Hz | some sharper continental orchestras |
Every row is B-1 — only the A4 you tune to changes. A frequency scales straight with the reference: B-1 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.