Open C Tuner

Open C tuning is C G C G C E, from low to high. The open strings form a C major chord.

Tune your guitar to Open C tuning (C G C G C E) with the mic tuner, step-by-step instructions, reference tones, and fretboard diagram below.

Hear Open C as a single open-string strum:

Tuner for Open C

Select a string, start the mic tuner, play the note clearly, and adjust the string until the meter shows that it is in tune.

Target

Detected

Difference

Note: The mic tuner works best in a quiet room. Use one string at a time.

Use this diagram to see where the notes sit on the fretboard in Open C tuning.