This table lists the frequencies in Hz for 4 octaves of musical notes when tuning according to a twelve-tone equal temperament.

Note that the frequencies of other octaves can be easily calculated by multiplying (or dividing) the frequencies of the previous octave (or next respectively) by 2. So, the frequency of note `x` = 2*(frequency of note `x`−12)

`freq` = `base`*2^{(x/12)}

where `base` can be any base frequency, for which `x` = 0 (in the table 55, but generally 440 Hz, which is the standard reference frequency for the *A* note).

`x` is the position relative to this base note, of the note to be calculated. For example, when the base is 440 (= *A*) and you want to calculate the frequency of the next *C* note, the relative position of this *C* is 3. For notes below the base note, the relative position is negative.

Mind that for the lower notes, a higher number of digits is necessary than for the higher ones. This is due to the fact that the low tones have frequencies much closer to each other than the high ones. If you use too few digits for the lower notes, they'll sound out of tune.

n | x | Hz |
---|---|---|

a | 0 | 55 |

a# | 1 | 58.270 |

b | 2 | 61.735 |

c | 3 | 65.406 |

c# | 4 | 69.296 |

d | 5 | 73.416 |

d# | 6 | 77.782 |

e | 7 | 82.407 |

f | 8 | 87.307 |

f# | 9 | 92.499 |

g | 10 | 97.999 |

g# | 11 | 103.83 |

a | 12 | 110 |

a# | 13 | 116.54 |

b | 14 | 123.47 |

c | 15 | 130.81 |

c# | 16 | 138.59 |

d | 17 | 146.83 |

d# | 18 | 155.56 |

e | 19 | 164.81 |

f | 20 | 174.61 |

f# | 21 | 185.00 |

g | 22 | 196.00 |

g# | 23 | 207.65 |

a | 24 | 220 |

a# | 25 | 233.08 |

b | 26 | 246.94 |

c | 27 | 261.63 |

c# | 28 | 277.18 |

d | 29 | 293.66 |

d# | 30 | 311.13 |

e | 31 | 329.63 |

f | 32 | 349.23 |

f# | 33 | 369.99 |

g | 34 | 392.00 |

g# | 35 | 415.30 |

a | 36 | 440 |

a# | 37 | 466.16 |

b | 38 | 493.88 |

c | 39 | 523.25 |

c# | 40 | 554.37 |

d | 41 | 587.33 |

d# | 42 | 622.25 |

e | 43 | 659.26 |

f | 44 | 698.46 |

f# | 45 | 739.99 |

g | 46 | 783.99 |

g# | 47 | 830.61 |

a | 48 | 880 |

Alexander Thomas 1998-2021