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A♯0 / B♭0 · 29.14 Hz

A♯0 is piano key 2 of 88 and MIDI note 22 - the very bottom of the piano, more felt than heard - fundamental frequencies down here are below many speakers. Play the pure tone below, tune to it, or explore the note in every octave.

29.14Hz

Volume50%

Waveform

A♯0 at a glance

Frequency

29.14 Hz

Wavelength (in air)

11.77 m

MIDI note

22

Piano key

2 / 88

Octave

0

Enharmonic

B♭0

All values assume twelve-tone equal temperament at the international standard pitch of A4 = 440 Hz. In that system every semitone has the same size - a frequency ratio of 2^(1/12) - so A♯0 is exactly 440 × 2^(-47/12) Hz. Under alternative references the note shifts with the reference: at A4 = 432 Hz, A♯0 becomes 28.61 Hz.

A♯ in every octave

Note	Frequency	MIDI	Piano key
A♯0 ←	29.14 Hz	22	2
A♯1	58.27 Hz	34	14
A♯2	116.54 Hz	46	26
A♯3	233.08 Hz	58	38
A♯4	466.16 Hz	70	50
A♯5	932.33 Hz	82	62
A♯6	1864.7 Hz	94	74
A♯7	3729.3 Hz	106	86

Each octave doubles the frequency - the simplest relationship in music, and the reason notes an octave apart sound like “the same note, higher”.

Neighboring notes

A0 · 27.50 HzA♯0 · 29.14 HzB0 · 30.87 Hz C1 · 32.70 Hz

One semitone down is A0 at 27.50 Hz; one semitone up is B0 at 30.87 Hz. Need a frequency between notes, or a different waveform? The tone generator plays anything from 20 Hz to 20 kHz; the note ↔ frequency converter does the math both directions, and the chromatic tuner listens to your instrument and shows the offset in cents.

A♯0 FAQ

What frequency is A♯0?

A♯0 / B♭0 is 29.14 Hz in twelve-tone equal temperament with the standard reference of A4 = 440 Hz. Every semitone step multiplies the frequency by the twelfth root of two (about 1.0595), and A♯0 sits 47 semitones below A4.

What MIDI number and piano key is A♯0?

A♯0 is MIDI note 22 and key 2 of 88 on a standard piano. Octave numbering follows scientific pitch notation, where middle C is C4 (MIDI 60).

How do I tune to A♯0?

Play the tone above and match your instrument by ear until the beating between the two pitches slows and disappears, or use the chromatic tuner with your microphone for a cents readout. Small mistunings show up as slow beats: one beat per second at this pitch means you are about 58.4 cents off.

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