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Recognised as Musical note

A2

  • A2
  • 110 Hz
  • MIDI 45

A2 is MIDI note 45, sounding at 110 Hz in equal temperament with A4 = 440 Hz. Its wavelength in air is 3.1182 m, and it sits in octave 2.

Pitch

Scientific pitch notationA2
MIDI note number45
Frequency110 Hzequal temperament, A4 = 440 Hz, a convention rather than a constant
Pitch classA (9)
Octave2

As a sound wave

Wavelength in air3.1182 mat 343 m/s, dry air at 20 °C
Period9.0909 ms
Frequency one octave up220 Hzdoubling the frequency
Frequency one octave down55 Hz
AudibleYeshuman hearing runs roughly 20 Hz to 20 kHz and narrows with age

Intervals from here

Octave belowA1 · 55 Hz
Perfect fifth belowD2 · 73.42 Hz
Semitone belowG#2 · 103.83 Hz
Semitone aboveA#2 · 116.54 Hz
Major third aboveC#3 · 138.59 Hz
Perfect fifth aboveE3 · 164.81 Hz
Octave aboveA3 · 220 Hz

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Nearby notes

The same note in other octaves

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Every value on this page was computed from “note a2” by Nerdulator’s reference engine. Nothing here was retrieved from a database of answers or written by a model.