String gauge reference
Each guide pairs one tuning and scale length with a calculated tension table. Compare nearby gauges before choosing a set for your guitar.
Open the string tension calculator Read the calculation methodologyStart with the scale length. A gauge that works on a 27-inch instrument can feel different on a 25.5-inch guitar.
Compare the whole set. The low string matters, but large tension jumps across the set affect feel too.
Plan a setup. A meaningful gauge change can require nut, intonation, action, or relief adjustments.
D A D G B ECompare a calculated .009–.052 starting set for Drop D on a 25.5-inch guitar, with per-string tension estimates and setup notes.
D A D G A DCompare a calculated .010–.048 starting set for DADGAD on a 25.5-inch guitar, with tension estimates and setup guidance.
C G C F A DCompare a calculated .011–.054 starting set for Drop C on a 25.5-inch guitar, including tension estimates and setup considerations.
A E A D G B ECompare a calculated .010–.064 starting set for 7-string Drop A on a 25.5-inch guitar, with tension estimates and setup guidance.
G D G C F A DCompare a calculated .011–.070 starting set for 7-string Drop G on a 26.5-inch guitar, with per-string tension estimates and setup notes.
E B E A D G B ECompare a calculated .010–.080 starting set for 8-string Drop E on a 27-inch guitar, including tension estimates and setup notes.
AltTuningLab estimates tension from pitch, scale length, gauge, and plain or wound construction. Wound-string designs differ among manufacturers, so use the figures to compare options and verify your final choice with the string maker’s information and a proper setup.