Frequency to Note Calculator
Frequency to Note
Convert a frequency (Hz) to the nearest musical note
Note to Frequency
Find the exact frequency of a specific note and octave
Formula
Semitones from A4 = 12 x log2(f / A4) | Frequency = A4 x 2^(semitones/12) | Cents = (semitones - round(semitones)) x 100
Frequently Asked Questions
What frequency is middle C?
Middle C (C4) is approximately 261.63 Hz at standard A4 = 440 Hz tuning. This is the C closest to the center of a piano keyboard.
What are cents in music?
A cent is 1/100th of a semitone. There are 1200 cents in an octave. Cents are used to measure small pitch differences. Being within +/-5 cents is generally considered in tune for most instruments.
Why would I change the concert pitch from 440 Hz?
Some orchestras tune to A = 442 or 443 Hz for a brighter sound. Baroque ensembles often use A = 415 Hz. Some musicians prefer A = 432 Hz. The calculator lets you use any reference pitch.
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