A♯7 / B♭7
3,729.31Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
106
Piano key
86
Octave
7
Frequency
3,729.31 Hz
Period
0.2681 ms
Wavelength
0.092 m
Pitch class
A♯
Notation
SPN
MIDI is the note number synths and software pass around (0–127). Pitch class is the note without its octave — all the A♯s share one. Enharmonic spellings (A♯7 and B♭7) name the same pitch two ways.
At other reference pitches
| Reference (A4) | A♯7 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 3,661.504 Hz | the alternative-tuning circle |
| 440 Hzstandard | 3,729.31 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 3,746.262 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 3,754.737 Hz | some sharper continental orchestras |
Every row is A♯7 — only the A4 you tune to changes. A frequency scales straight with the reference: A♯7 at 432 Hz is the 440 Hz value times 432⁄440.
Move around
Every A♯
Chords with A♯ in them
A♯ appears in each of these — see the whole chord grid.