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Key takeaways
- This guide uses C–G–C–F–A–D from low to high.
- The low E-to-C change leaves about 63% of the original tension with the same string and scale.
- The low C usually needs a larger relative gauge increase than the upper five strings.
- Check nut fit, relief, action, and intonation after choosing the final set.
How to use this: Use these recommendations to compare options, then check the final set against the string maker's specifications and confirm that it suits your instrument.
Quick answer
A .011-based set is a practical Drop C starting point
On a 25.5-inch six-string, many players should compare an 11–54, 11–56, or 11–58 family rather than accepting one universal Drop C set. The low C loses more tension than the upper five strings, so choose its gauge separately and use the calculator to match a reference setup.
The low string drops four semitones from standard E.
Choose the bass end by target tension and attack.
Check the nut slot, bridge travel, relief, and intonation.
How to calculate a Drop C string gauge
First calculate the E-standard set you already know. Load Drop C, keep the same scale, and use the saved per-string tensions as targets rather than choosing a pack by its first string alone.
- Enter the exact E-standard gauges and save the result.
- Switch to C2–G2–C3–F3–A3–D4 without changing the scale.
- Solve the upper five strings against their familiar targets.
- Choose the low C separately because it moves four semitones from E2.
- Round to a real set and recalculate all six sold gauges.
Worked example: what four semitones costs a .046 low E
C2 sits four semitones below standard low E. Keep the same .046 string through that retune and it gives up close to 37% of its pull, leaving about 63.0% of the original tension. An equivalent plain-string diameter would be near .058 inch, which is why a low string around .056 to .060 is worth testing on a 25.5-inch guitar.
The string is wound, so that diameter is a starting estimate rather than a product guarantee. Recalculate a specific string or use manufacturer tension data when it is available.
| Low string | Pitch | Purpose |
|---|---|---|
| .046 | E2 | Original reference |
| .046 | C2 | About 37% less tension |
| .056–.060 | C2 | Range to test against the original target |
Interpret the result before buying strings
A good calculated profile can still fail mechanically if the thick low string does not fit or intonate. Complete the tension decision before adjusting the guitar.
- Use a firmer low C for hard picking and a lighter one for easier bends or vibrato.
- Expect a 24.75-inch guitar to need more gauge than a 25.5-inch guitar for the same target.
- Check whether the third string is plain or wound before comparing values.
- Revisit nut slots, relief, action, bridge balance, and intonation after installation.
Practical Drop C starting sets
These are starting points based on common feel targets. Construction varies, so compare the exact product in the calculator when unit-weight data is available.
| Scale | Light | Balanced | Heavy |
|---|---|---|---|
| 24.75 in | 11–15–19–32–44–58 | 12–16–20–34–46–60 | 13–17–22w–36–48–62 |
| 25.5 in | 10–13–17–28–40–54 | 11–14–18–30–42–56 | 12–16–20–34–46–60 |
| 26.5 in | 10–13–17–28–40–54 | 11–14–18–30–42–56 | 12–15–19–32–44–58 |
| 27–28 in baritone | 9–12–16–26–36–48 | 10–13–17–28–40–52 | 11–14–18–30–42–56 |
The low C is the first gauge to adjust if the set feels uneven. A wound third is optional in the heavier sets.
Drop C versus standard tuning tension
Lowering a note by a whole step reduces theoretical tension to about 79.4% of its previous value with the same string and scale. The low E-to-C change spans four semitones and retains only about 63% of the original tension.
That uneven loss explains why simply detuning a regular set often leaves the sixth string much softer than the others.
Nut, relief, action, and intonation
A larger low string may bind in the nut slot. Widening a slot is irreversible work and should preserve the correct bottom profile and break angle. Increased total tension can also change neck relief, while the different speaking behaviour requires saddle intonation adjustment.
Make one change at a time, tune to pitch, allow the neck to settle, and then check relief, action, and intonation in that order.
- Confirm the low string fits the nut without pinching.
- Check tuner-post capacity before using very large gauges.
- Re-intonate after the final gauge and tuning are stable.
- Use an experienced technician if nut or truss-rod work is unfamiliar.
Drop C on a seven-string guitar
Seven-string “Drop C” can describe more than one pitch layout. State the full tuning before choosing gauges. If the seventh string remains below the dropped sixth, its scale and target pitch become the dominant gauge constraints.
Reference material
Technical references
Use these manufacturer references when you need product-specific tension or setup information. They were last reviewed on ; the gauge suggestions on this page remain starting points because strings and instruments vary.
Before you change strings
Save your current setup, change one variable at a time, and recheck tuning, neck relief, action, and intonation after the new strings settle. If a result looks inconsistent with your instrument or a manufacturer's data, send the setup details through the contact page.