Open C Tuner Online
Tune your guitar by ear with your microphone, free.
Open C is a deep, orchestral tuning — strum the open strings and a wide C major chord rings out with a huge low end, beloved by fingerstyle players for its resonance. Tune to it below.
About Open C Tuning
Open C tuning is C G C G C E (low to high). The open strings form an expansive C major chord stacked across nearly three octaves, giving the tuning a rich, almost piano-like resonance. With three open C notes and a pair of Gs, it produces a powerful drone that suits both heavy detuned riffing and lush fingerstyle arrangements — this is the "Keith Richards" open C variant.
To reach Open C from standard EADGBE, derive each string: the low E drops two whole steps to C, the A drops a whole step to G, the D drops a whole step to C, the G string stays at G (unchanged), the B raises a half step to C, and the high E stays at E (unchanged). So four strings move and two — the G and high E — keep their standard pitch. Because the low C is tuned down a long way, a heavier sixth string helps keep it tight and in tune.
The result is a deep, ringing open chord that gives solo guitar a full, harp-like body.
Common Genres
- Fingerstyle and acoustic instrumental
- Folk and singer-songwriter
- Ambient and post-rock
- Detuned alternative rock
Famous Songs
- Friends — Led Zeppelin
- Bron-Yr-Aur — Led Zeppelin
- Ocean — John Butler Trio
How to use this tuner
- Click Start Tuner and allow microphone access when prompted.
- Pluck each string in turn — the matching peg below lights up automatically.
- Tap any peg to hear its exact target pitch as a reference.
- Drop the low E, A and D strings, raise the B, and leave G and high E — until each dial sits in the green band.
FROM TUNED TO PLAYING
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