A♯2 / B♭2
116.541Hz at concert pitch
Press to hear a pure sine tone at this pitch.
MIDI note
46
Piano key
26
Octave
2
Frequency
116.541 Hz
Period
8.5807 ms
Wavelength
2.9432 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♯2 and B♭2) name the same pitch two ways.
At other reference pitches
| Reference (A4) | A♯2 frequency | Where you meet it |
|---|---|---|
| 432 Hz | 114.422 Hz | the alternative-tuning circle |
| 440 Hzstandard | 116.541 Hz | the ISO 16 standard — concert pitch |
| 442 Hz | 117.071 Hz | many European orchestras tune a touch sharp |
| 443 Hz | 117.336 Hz | some sharper continental orchestras |
Every row is A♯2 — only the A4 you tune to changes. A frequency scales straight with the reference: A♯2 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.