D'Addario · XS Phosphor Bronze (coated) · 12-16-24-32-42-53

D'Addario XSAPB1253 (12-16-24-32-42-53) in Eb standard on a 25.5" scale

12-53 Light, XS Phosphor Bronze Coated Acoustic Guitar Strings on an acoustic guitar with a 25.5" scale, tuned to Eb standard (Eb4 Bb3 Gb3 Db3 Ab2 Eb2), pulls 143.1 lb64.9 kg637 N in total and 23.9 lb10.82 kg106 N per string on average. That is a loose feel for an acoustic guitar. The set is very even (spread 0.1%). String 2 (Bb3) deviates most: −13% from the set average.

Total tension: 143.1 lb64.9 kg637 N
Average per string: 23.9 lb10.82 kg106 N
Feel: loose; medium ≈ 26.8 lb12.14 kg119 N per string; Set your own preferred feel
Balance: very even; spread 0.1%

Tension per string

The bronze dashed line is the medium-feel target: the average per-string tension of a 12-53 set on a 25.5" scale in E standard (26.8 lb12.14 kg119 N). Loose and tight are measured against it.Line thickness follows the string gauge; textured lines are wound strings. Hover, tap or tab to a string for details.

#	Note	Hz	Gauge	Item	Type	Tension	vs avg
1	Eb4	311.1	.012	XSPL012	plain	20.9 lb9.46 kg93 N	−13%
2	Bb3	233.1	.016	XSPL016	plain	20.8 lb9.42 kg92 N	−13%
3	Gb3	185.0	.024	XSPB024	wound	26.8 lb12.17 kg119 N	+13%
4	Db3	138.6	.032	XSPB032	wound	26.7 lb12.09 kg119 N	+12%
5	Ab2	103.8	.042	XSPB042	wound	25.8 lb11.69 kg115 N	+8%
6	Eb2	77.8	.053	XSPB053	wound	22.2 lb10.07 kg99 N	−7%
Total						143.1 lb64.9 kg637 N

Open in the calculator

Similar sets in Eb standard, 25.5"

Set	Gauges	Avg per string	Total	Feel	Balance
D'Addario XSABR1253	12-16-24-32-42-53	23.3 lb10.58 kg104 N	140.0 lb63.5 kg623 N	loose	very even
Elixir 11050	12-16-24-32-42-53	23.5 lb10.68 kg105 N	141.3 lb64.1 kg628 N	loose	very even
Elixir 11052	12-16-24-32-42-53	23.5 lb10.68 kg105 N	141.3 lb64.1 kg628 N	loose	very even
XSAPB1253 (this page)	12-16-24-32-42-53	23.9 lb10.82 kg106 N	143.1 lb64.9 kg637 N	loose	very even
D'Addario EJ16	12-16-24-32-42-53	23.9 lb10.82 kg106 N	143.1 lb64.9 kg637 N	loose	very even
Elixir 16052	12-16-24-32-42-53	24.2 lb10.98 kg108 N	145.3 lb65.9 kg646 N	loose	very even

Best match for a medium feel in Eb standard, 25.5"

Ranked by how close every string is to 26.8 lb12.14 kg119 N (lower deviation is better).

Elixir 11100 13-17-26-35-45-56 deviation 2.3%, average 27.2 lb12.36 kg121 N, very even; same gauges: 11102, 16102
D'Addario EJ17 13-17-26-35-45-56 deviation 3.8%, average 27.5 lb12.50 kg123 N, very even
Elixir 16182 13-17-25-32-42-53 deviation 5.7%, average 25.8 lb11.72 kg115 N, even; same gauges: 11182

More for the XSAPB1253

Other tunings on 25.5": E standard, Drop D, D standard, Drop C, Open G, Open D, DADGAD

Eb standard on other scales: 24.75", 25"

About these numbers

Tension is calculated, not measured: T = μ · (2 · L · f)², where μ is the string's mass per unit length (unit weight), L the vibrating length (scale) and f the pitch (A4 = 440 Hz, equal temperament). kg means kilogram-force: 1 kg ≈ 9.81 N ≈ 2.205 lb.

How a set feels also depends on the guitar's setup: action height, break angle over the nut and saddle, string length behind the nut and bridge, and your playing style. Plain strings feel stiffer than wound strings at the same tension. Use these figures to compare sets, not as an absolute measure of feel.

Sources

D'Addario product page, tension chart for XSAPB1253 (2026-10-31): unit weights derived from the published tensions, cross-checked across sets.