![]() Where n is the number of half-steps above or below the A440 reference pitch. Rather, you use the formula: frequency = 440 * 2^(n/12) In Equal Temperament, pitches aren't determined by whole-number ratios. Not close enough not to be noticeable, though. In the end, and adjusting for octaves, you get that Gb = 366.25 Hz while F# = 371.25 Hz. Meanwhile, the D below the A440 is tuned to 440 * 2/3 = 293.333 Hz, the G below the D is tuned to 293.333 * 2/3 = 195.555 Hz, and so on. The F♯ above the B is tuned to 990 * 3/2 = 1485 Hz. The B above the E is tuned to 660 * 3/2 = 990 Hz. Then the E above the A is tuned to 440 * 3/2 = 660 Hz. intervals in which the ratios of the frequencies are in whole-number pairs, then Gb isn't exactly the same as F#.įor example, say you're tuning to A440 and using perfect intervals. ![]() If you're tuning by perfect intervals, i.e. It depends on the tuning system being used.
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