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Key takeaways
- Gauge is outside diameter, usually stated in thousandths of an inch.
- Pack labels such as 10–46 name only the first and last strings unless the complete set is listed.
- Two wound strings with the same gauge can have different tension and stiffness.
- Start from a setup you know and adjust individual outliers instead of guessing from pack names.
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
Read the whole set, not only the first-string number
A guitar string gauge chart translates package shorthand into the diameter of every string. A “set of 10s” only identifies the .010 first string, while the wound bass gauges and their construction determine much of the set’s balance.
.010 means ten thousandths of an inch.
10–46 does not reveal the four middle strings.
Equal outside diameter does not guarantee equal unit weight.
How to use a guitar string gauge chart
Start by identifying the complete set currently installed. Compare each string against the new set and calculate the changed strings at the real scale and tuning.
- Record all gauges from the package rather than only the high and low strings.
- Separate plain and wound strings when comparing materials or construction.
- Use the tension calculator to test the proposed set on the actual instrument.
- Change individual outliers with a hybrid or custom set instead of moving every string automatically.
- Plan nut, relief, action, tremolo, and intonation checks after a meaningful change.
Worked example: .009 versus .010 plain steel
At the same pitch and scale, tension for equivalent plain-steel construction is approximately proportional to diameter squared. Moving from .009 to .010 therefore raises theoretical tension by about 23.5%, which is much larger than the 11.1% diameter change.
| Plain gauge | Diameter | Relative tension at same pitch |
|---|---|---|
| 9 | 0.009 in / 0.229 mm | 100% baseline |
| 9.5 | 0.0095 in / 0.241 mm | About 111.4% |
| 10 | 0.010 in / 0.254 mm | About 123.5% |
Do not apply this diameter-squared shortcut to dissimilar wound strings.
Choose gauge by the job it must do
Lighter is not automatically easier if the setup buzzes, and heavier is not automatically better if bending or structure becomes a problem. Use gauge as one part of a setup decision.
- For easier bends, compare a half-step gauge change before replacing the entire set.
- For lower tunings, strengthen the strings that lose the most tension.
- For a shorter scale, calculate whether a slightly heavier string restores the familiar pull.
- For acoustic guitars, follow builder guidance and instrument condition before increasing total load.
Gauge to diameter conversion
Multiply inches by 25.4 to convert to millimetres. The table lists common plain and wound guitar gauges.
| Gauge name | Diameter (in) | Diameter (mm) | Typical construction |
|---|---|---|---|
| 8 | .008 | 0.203 | Plain steel |
| 9 | .009 | 0.229 | Plain steel |
| 10 | .010 | 0.254 | Plain steel |
| 13 | .013 | 0.330 | Plain steel |
| 17 | .017 | 0.432 | Plain steel |
| 24 | .024 | 0.610 | Plain or wound |
| 32 | .032 | 0.813 | Wound |
| 46 | .046 | 1.168 | Wound |
| 56 | .056 | 1.422 | Wound |
Common electric and acoustic sets
Set labels describe the first-string gauge, not a universal recipe. Always read the complete package.
| Nickname | Example gauges | Typical feel at 25.5 in |
|---|---|---|
| 8s | 8–10–15–21–30–38 | Very light |
| 9s | 9–11–16–24–32–42 | Light |
| 10s | 10–13–17–26–36–46 | Regular electric |
| 11s | 11–14–18–28–38–49 | Firm electric |
| 12s acoustic | 12–16–24–32–42–53 | Light acoustic |
| 13s acoustic | 13–17–26–35–45–56 | Medium acoustic |
Plain versus wound strings
Plain strings are a single wire, so diameter and material give a direct estimate of mass per length. Wound strings combine a core and wrap. Two wound strings with the same outside gauge can have different core ratios and therefore different tension and bending stiffness.
That is why the calculator’s wound-string results are estimates unless a manufacturer’s exact unit-weight data is available.
Choosing a gauge without guesswork
Start with a setup you already know. Record its scale, tuning, gauges, and per-string tension. After changing tuning or scale, use reverse gauge mode to target the same tension profile, then round to real commercially available gauges.
A final setup may still require truss-rod, action, nut-slot, and intonation adjustments. Large changes in total tension should be made deliberately.
Choose gauge by tuning, scale, and playing task
A pack name is a starting point, not a verdict. Longer scales and higher pitches raise tension, while lower tunings reduce it. A player who bends a full tone on the treble side and palm-mutes hard on the bass side may be better served by a hybrid set than by making all six strings heavier.
Begin with the set already on the instrument and describe the problem one string at a time. If only the dropped sixth string feels loose, replacing that string changes less neck load and preserves the treble response you already like.
| What you notice | First comparison to try | Check after fitting |
|---|---|---|
| Treble bends require too much effort | One step lighter on strings 1–3 | Tuning stability and fret buzz |
| Dropped bass note sounds unfocused | One or two gauges heavier on the lowest string | Nut fit and saddle travel |
| Whole set feels soft after tuning down | Calculate an equivalent profile at the new tuning | Relief, action, and intonation |
| Picking hand overdrives one middle string | Smooth the adjacent tension jump | Attack balance at performance volume |
What the set label leaves out
The familiar 9–42 or 10–46 label gives only the first and sixth gauges. Intermediate strings can vary, and wound strings with equal outside diameter can use different core-to-wrap ratios. Alloy, coating, round- or hex-core construction, and winding method can all change response.
Record the six individual gauges and exact product name when you find a set that works. That record lets you compare a proposed set string by string instead of assuming every package with the same endpoints will reproduce the feel.
- Gauge describes diameter, not complete construction.
- Numerical tension describes open-string pull, not bending stiffness by itself.
- A coated string can feel smoother even when its nominal gauge is unchanged.
- A wound third should be compared with a plain third as a construction change, not only a gauge change.
A controlled way to test a new gauge
Save the current calculator setup and write down relief, action at the 12th fret, and any intonation offset you can observe. Install the proposed set, stretch it gently, tune repeatedly until stable, and play the same passage with the same pick and amplification.
Recheck measurements only after the strings settle. A small gauge move may need no adjustment, but a floating tremolo or a large total-tension change can alter bridge angle, relief, and action together. If several variables moved, correct the setup before judging the strings.
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.