D'Addario · Phosphor Bronze · 13-17-26-35-45-56

D'Addario EJ17 (13-17-26-35-45-56) in D standard on a 25.5" scale

13-56 Medium, Phosphor Bronze Acoustic Guitar Strings on an acoustic guitar with a 25.5" scale, tuned to D standard (D4 A3 F3 C3 G2 D2), pulls 147.3 lb66.8 kg655 N in total and 24.5 lb11.13 kg109 N per string on average. That is a loose feel for an acoustic guitar. The set is very even (spread 2.5%). String 4 (C3) deviates most: +16% from the set average.

Total tension: 147.3 lb66.8 kg655 N
Average per string: 24.5 lb11.13 kg109 N
Feel: loose; medium ≈ 26.8 lb12.14 kg119 N per string; Set your own preferred feel
Balance: very even; spread 2.5%

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	D4	293.7	.013	PL013	plain	21.8 lb9.89 kg97 N	−11%
2	A3	220.0	.017	PL017	plain	20.9 lb9.49 kg93 N	−15%
3	F3	174.6	.026	PB026	wound	27.9 lb12.65 kg124 N	+14%
4	C3	130.8	.035	PB035	wound	28.5 lb12.94 kg127 N	+16%
5	G2	98.0	.045	PB045	wound	26.1 lb11.82 kg116 N	+6%
6	D2	73.4	.056	PB056	wound	22.1 lb10.02 kg98 N	−10%
Total						147.3 lb66.8 kg655 N

Open in the calculator

Similar sets in D standard, 25.5"

Set	Gauges	Avg per string	Total	Feel	Balance
Elixir 16182	13-17-25-32-42-53	23.0 lb10.44 kg102 N	138.1 lb62.6 kg614 N	loose	even
Elixir 16077	12-16-24-35-45-56	23.4 lb10.60 kg104 N	140.2 lb63.6 kg623 N	loose	moderately uneven
Elixir 11100	13-17-26-35-45-56	24.3 lb11.01 kg108 N	145.6 lb66.1 kg648 N	loose	very even
Elixir 11102	13-17-26-35-45-56	24.3 lb11.01 kg108 N	145.6 lb66.1 kg648 N	loose	very even
EJ17 (this page)	13-17-26-35-45-56	24.5 lb11.13 kg109 N	147.3 lb66.8 kg655 N	loose	very even
Elixir 16102	13-17-26-35-45-56	24.9 lb11.31 kg111 N	149.6 lb67.9 kg666 N	loose	very even

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

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

Elixir 16102 13-17-26-35-45-56 deviation 7.5%, average 24.9 lb11.31 kg111 N, very even; same gauges: 11100, 11102
D'Addario EJ17 13-17-26-35-45-56 deviation 8.8%, average 24.5 lb11.13 kg109 N, very even
Elixir 16182 13-17-25-32-42-53 deviation 14.4%, average 23.0 lb10.44 kg102 N, even; same gauges: 11182

More for the EJ17

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

D 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 EJ17 (2026-10-31): unit weights derived from the published tensions, cross-checked across sets.