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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.
An alternative pitch standard known as philosophical or scientific pitch fixes middle C at 256 Hz (that is, 2 8 Hz), which results the A above it being approximately 430.54 Hz in equal temperament tuning.