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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 tone played here has a frequency of 262 Hz. And this tone here has a frequency of 440 Hz. The first one was a Middle C, and the second was the A above Middle C, or Concert A. In music, the pitch of a certain note is defined as the perception of frequency. Hearing musical pitch helps us to put different sounds in order from high to low frequency.