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About E2
E2 has a frequency of 82.41 Hz in standard tuning, where A4 is fixed at 440 Hz. It is MIDI note 40 and key number 20 on an 88-key piano.
E2 is the lowest open string of a guitar in standard tuning.
In equal temperament every semitone multiplies the frequency by the twelfth root of two (≈1.05946), so E2 is 29 semitones below A4: f = 440 × 2^((40 − 69) / 12) = 82.41 Hz. The number in the name is the octave in scientific pitch notation, which starts each octave on C.
E2 frequency in different tunings
| Tuning reference | E2 frequency |
|---|---|
| A4 = 440 Hz (ISO 16 standard) | 82.41 Hz |
| A4 = 442 Hz (many European orchestras) | 82.78 Hz |
| A4 = 443 Hz (Berlin, Vienna) | 82.97 Hz |
| A4 = 435 Hz (French diapason normal, 1859) | 81.47 Hz |
| A4 = 432 Hz (alternative tuning) | 80.91 Hz |
| A4 = 415 Hz (Baroque pitch) | 77.72 Hz |
| C4 = 256 Hz (scientific pitch) | 80.63 Hz |
Where to play E2 on a guitar
Standard tuning (E A D G B E), frets 0–22.
- 6th string (low E), open
Intervals from E2
| Interval | Note | Frequency | Ratio (just) |
|---|---|---|---|
| Minor second | F2 | 87.31 Hz | 16:15 |
| Major second | F♯2 | 92.5 Hz | 9:8 |
| Minor third | G2 | 98 Hz | 6:5 |
| Major third | G♯2 | 103.83 Hz | 5:4 |
| Perfect fourth | A2 | 110 Hz | 4:3 |
| Tritone | A♯2 | 116.54 Hz | 45:32 |
| Perfect fifth | B2 | 123.47 Hz | 3:2 |
| Minor sixth | C3 | 130.81 Hz | 8:5 |
| Major sixth | C♯3 | 138.59 Hz | 5:3 |
| Minor seventh | D3 | 146.83 Hz | 9:5 |
| Major seventh | D♯3 | 155.56 Hz | 15:8 |
| Octave | E3 | 164.81 Hz | 2:1 |
Instruments and voices that can play E2
Frequently asked questions
What is the frequency of E2?
E2 is 82.41 Hz when A4 = 440 Hz (80.91 Hz if A4 = 432 Hz).
What MIDI number is E2?
E2 is MIDI note number 40.
Is E2 on a piano?
Yes – it is key 20 of 88.
Where is E2 on the guitar?
In standard tuning: 6th string (low E), open.