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Most of the websites i have looked at, say that the frequency of middle C note is approximately 261.626 Hz. and that middle C on guitar is at the 5th string 3rd fret. but my tuner says the frequency at the 5th string 3rd fret is 130.81 Hz.
The concert pitch A4 = aâ on the piano lies in the. octave between C4 = câ (middle C) and C5= cââ. The middle C note as octave C4 and the next octave C5. Middle C is designated C4 in scientific pitch notation with a frequency of 261.6 Hz, because of the note's position as the fourth C key on a standard 88 key piano keyboard. Some manufacturers label the 440 Hz concert pitch not correctly as A3.