A♯8 / B♭8
7,458.62Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
118
Piano key
—
Octave
8
Frequency
7,458.62 Hz
Period
0.1341 ms
Wavelength
0.046 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♯8 and B♭8) name the same pitch two ways. This note falls outside the 88-key piano, so it has no piano key number.
At other reference pitches
| Reference (A4) | A♯8 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 7,323.009 Hz | the alternative-tuning circle |
| 440 Hzstandard | 7,458.62 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 7,492.523 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 7,509.474 Hz | some sharper continental orchestras |
Every row is A♯8 — only the A4 you tune to changes. A frequency scales straight with the reference: A♯8 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.