B2 at every common reference pitch
A note’s frequency depends on what A4 is tuned to. The standard is 440 Hz; the other three are the ones you are most likely to meet. The cents column is how far each one sits from the 440 version — the same for every note, because changing the reference moves the whole scale together.
| Reference | B2 | vs 440 |
|---|---|---|
| A4 = 415 Hz · Baroque pitch | 116.46 Hz | −101.3¢ |
| A4 = 432 Hz · “Verdi” pitch | 121.23 Hz | −31.8¢ |
| A4 = 440 Hz · Standard (ISO 16) | 123.47 Hz | — |
| A4 = 442 Hz · Orchestral | 124.03 Hz | +7.9¢ |
One cycle of B2 lasts 8.099 ms, and its wavelength in air at 20 °C is 2.78 m. Hold it as a steady tone in the tone generator.
B2 on the piano
B2 is key 27 of 88, counting from the bottom — a white key. Press any key below to compare it with its neighbours.
B2 on the guitar
In standard tuning B2 is played in 2 places: 6th (low E) string, fret 7 and 5th (A) string, fret 2. The same pitch in each place, with a different tone: lower strings sound warmer. Guitar music is written an octave higher than it sounds, so on a guitar part this note is printed as B3.
B2 on the staff
Instruments that can play B2
25 instruments play B2 within the normal range. Each links to its range chart; for a transposing instrument, the note on its part is shown.
Bowed strings
Guitars and basses
Woodwind
Keyboards and free reeds
Voices: B2 is inside the typical range of the bass and baritone. Test your own range.
The harmonics of B2
A played B2 is not one frequency. A string or a pipe also sounds whole-number multiples of it, and the mix of those harmonics is the instrument’s tone. Here is where the first eight land — and why the 7th sounds out of tune against a piano.
| Harmonic | Frequency | Nearest note | Off by |
|---|---|---|---|
| 1 (fundamental) | 123.47 Hz | B2 | 0¢ |
| 2 | 246.94 Hz | B3 | 0¢ |
| 3 | 370.41 Hz | F♯4 | +2.0¢ |
| 4 | 493.88 Hz | B4 | 0¢ |
| 5 | 617.35 Hz | E♭5 | −13.7¢ |
| 6 | 740.82 Hz | F♯5 | +2.0¢ |
| 7 | 864.30 Hz | A5 | −31.2¢ |
| 8 | 987.77 Hz | B5 | 0¢ |
Frequencies that land on B2
Frequently asked questions
What is the frequency of B2?
B2 is 123.47 Hz in equal temperament with A4 tuned to 440 Hz, the international standard. At A4 = 432 Hz it is 121.23 Hz, and at the orchestral A4 = 442 Hz it is 124.03 Hz.
Which octave is B2 in?
The number is the octave in scientific pitch notation, where each octave starts on C and C4 is middle C. B2 is in octave 2, 13 semitones below middle C. In Helmholtz notation, used in older books, it is written B.
How do I play B2 on a piano?
B2 is key 27 of 88, counting from the bottom — a white key.
Which instruments can play B2?
25 of the instruments we chart play B2 within their normal range, including cello, double bass, guitar, 7-string guitar, 8-string guitar.
Typing it? B2 is also written B2. Convert any frequency on the Hz-to-note converter.