Guitar tuning · C G C G C E
Open C tuning
Open C tuning: C G C G C E, low to high. Used for big, resonant acoustic sounds, slide and modern folk.
Notes and frequencies
| String | Note | Frequency |
|---|---|---|
| 6 | C2 | 65.41 Hz |
| 5 | G2 | 98.00 Hz |
| 4 | C3 | 130.81 Hz |
| 3 | G3 | 196.00 Hz |
| 2 | C4 | 261.63 Hz |
| 1 | E4 | 329.63 Hz |
Frequencies for A4 = 440 Hz.
From standard tuning
- Lower the 6th string 4 half steps: E → C.
- Lower the 5th string a whole step: A → G.
- Lower the 4th string a whole step: D → C.
- Raise the 2nd string a half step: B → C.
Check each string with a tuner, then go round once more — changing one string’s tension nudges the others.
One finger, one chord
The open strings form a C major chord. Barre all strings with one finger (or a slide) for other major chords:
FAQ
- What are the notes of Open C tuning?
- From the low string to the high string: C G C G C E.
- Is changing tuning bad for my guitar?
- No — tunings within a few half steps of standard are fine. For much lower tunings you keep long-term, heavier strings and a setup help with tension and intonation.
- How do I tune to it accurately?
- Use a chromatic tuner — it reads any note, not just standard tuning. Always tune up to the note so the string stays in tune.