7-String Drop A Gauges for a 25.5-Inch Guitar
On a 25.5-inch seven-string, Drop A puts the lowest string close to the limit where gauge choice becomes especially noticeable. The right answer depends on how much clarity you want from the low A and how stiff you want it to feel.
- Tuning
- A E A D G B E
- Strings
- 7
- Scale length
- 25.5 in
.010–.062 is the calculated starting point
Begin at .010–.062. It gives the low A more support than a typical .059 or .060 while keeping the upper six strings familiar to players coming from a standard-tuned six-string.
Estimated tension at 25.5 inches
Calculated from pitch, gauge, scale length, and a plain or wound construction estimate.
Scroll sideways to see all columns.
| String | Pitch | Gauge | Build | Estimated tension |
|---|---|---|---|---|
| 7 | A1 | .062 | wound | 12.6 lb |
| 6 | E2 | .046 | wound | 15.5 lb |
| 5 | A2 | .036 | wound | 16.9 lb |
| 4 | D3 | .026 | wound | 15.7 lb |
| 3 | G3 | .017 | plain | 16.6 lb |
| 2 | B3 | .013 | plain | 15.4 lb |
| 1 | E4 | .010 | plain | 16.3 lb |
Compare nearby gauges at the same pitch
The calculator holds A1 and 25.5 inches constant, then changes only the wound low-string gauge.
- .060
- 11.8 lb
- .062 Starting point
- 12.6 lb
- .064
- 13.4 lb
Use the table to make a confident adjustment
This practical, medium-feel set provides a comparison baseline. For a lighter touch, compare .060; for aggressive rhythm playing, compare .064. The calculator shows the trade-off instead of relying on a gauge number alone.
Plan for the full guitar setup
- 1Confirm that the low-string nut slot supports the chosen gauge without pinching.
- 2Check pickup height after a major string change; low strings move in a wider arc.
- 3If the low A remains indistinct, compare a longer scale length or a slightly heavier gauge before making an extreme jump.
7-string Drop A string-gauge FAQ
- Is .062 enough for a 7-string Drop A?
- It is a reasonable starting point on a 25.5-inch guitar. Whether it is enough depends on attack, action, and personal feel; use the table to compare it with .060 and .064.
- Can I use a regular 7-string set in Drop A?
- Some sets are suitable, but inspect the low-string gauge. A set intended for B standard may leave the dropped A looser than you want.