What is Open C tuning?
This version of Open C uses C G C G C E. The open strings contain only C, E, and G—the notes of a C major chord. Open C can produce a wide range and strong low drones, but the low sixth string moves far below standard pitch.
How to tune from standard
- Lower the sixth string from E2 to C2.
- Lower the fifth string from A2 to G2.
- Lower the fourth string from D3 to C3.
- Leave the third string at G3.
- Raise the second string carefully from B3 to C4.
- Leave the first string at E4, then recheck all strings.
Important: The second string tunes upward by one semitone while the low strings tune down. Approach C4 slowly and do not overtighten.
Open C target 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 |
Playing in Open C
The open position is C major. A full barre moves that major shape up the neck, while open C and G strings can ring beneath melodies. Standard-tuning chord shapes do not transfer directly, so use diagrams specifically written for C G C G C E.
Setup considerations
The sixth string may feel very loose at C2 on a light set. A heavier low string can improve definition, but large gauge changes may require nut and intonation work. Because Open C tunings vary, always confirm the exact string sequence before using a lesson or chord chart.