Calculated starting set
Drop C String Gauges for a 25.5-Inch Guitar
Drop C lowers every string by a whole step and the sixth string one more step. A balanced setup needs to address the low C while keeping the three plain strings playable.
- Tuning
- C G C F A D
- Strings
- 6
- Scale length
- 25.5 in
Recommendation
.011–.054 is the calculated starting point
Start with .011–.054 on a 25.5-inch guitar. It is a useful middle ground for a low C that needs definition without turning the upper strings into a noticeably heavy lead set.
Tension table
Estimated tension at 25.5 inches
Calculated from pitch, gauge, scale length, and a plain or wound construction estimate.
| String | Pitch | Gauge | Build | Estimated tension |
|---|---|---|---|---|
| 6 | C2 | .054 | wound | 13.5 lb |
| 5 | G2 | .042 | wound | 18.3 lb |
| 4 | C3 | .030 | wound | 16.6 lb |
| 3 | F3 | .018 | plain | 14.8 lb |
| 2 | A3 | .014 | plain | 14.2 lb |
| 1 | D4 | .011 | plain | 15.6 lb |
Low-string comparison
Compare nearby gauges at the same pitch
The calculator holds C2 and 25.5 inches constant, then changes only the wound low-string gauge.
- .052
- 12.5 lb
- .054 Starting point
- 13.5 lb
- .056
- 14.5 lb
What it should feel like
Use the table to make a confident adjustment
The .054 low C is the decision point. Go to .056 if the lowest string feels loose under a heavy pick, or down to .052 if you prefer a softer attack. The rest of this set tracks the lowered tuning rather than simply making every string heavier.
Before restringing
Plan for the full guitar setup
- 1Widen the nut slot only when the new string binds; have a technician do this if you are unsure.
- 2Re-check intonation and action after the instrument settles.
- 3A 24.75-inch guitar may need a heavier low string than this starting point; calculate using its actual scale length.
Common questions
Drop C string-gauge FAQ
- Are .010s too light for Drop C?
- A full .010 set often leaves the low C loose on a 25.5-inch guitar. A .054–.011 set gives more support at the bottom while remaining manageable at the top.
- Should I use a baritone guitar for Drop C?
- Not necessarily. A 25.5-inch guitar can work well in Drop C with an appropriate setup. A longer scale changes the feel and may let you use a lighter low string for similar tension.