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E2 · 82.41 Hz

E2 is piano key 20 of 88 and MIDI note 40 - the bass register, where bass lines and a male bass voice live. Play the pure tone below, tune to it, or explore the note in every octave.

82.41Hz
Volume50%
Waveform

E2 at a glance

Frequency
82.41 Hz
Wavelength (in air)
4.16 m
MIDI note
40
Piano key
20 / 88
Octave
2
Enharmonic
—

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 E2 is exactly 440 × 2^(-29/12) Hz. Under alternative references the note shifts with the reference: at A4 = 432 Hz, E2 becomes 80.91 Hz.

E in every octave

NoteFrequencyMIDIPiano key
E141.20 Hz288
E2 ←82.41 Hz4020
E3164.81 Hz5232
E4329.63 Hz6444
E5659.26 Hz7656
E61318.5 Hz8868
E72637.0 Hz10080

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

D2 · 73.42 HzD♯2 · 77.78 HzE2 · 82.41 HzF2 · 87.31 HzF♯2 · 92.50 Hz

One semitone down is D♯2 at 77.78 Hz; one semitone up is F2 at 87.31 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.

E2 FAQ

What frequency is E2?

E2 is 82.41 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 E2 sits 29 semitones below A4.

What MIDI number and piano key is E2?

E2 is MIDI note 40 and key 20 of 88 on a standard piano. Octave numbering follows scientific pitch notation, where middle C is C4 (MIDI 60).

How do I tune to E2?

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 20.9 cents off.

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