D'Addario · XL Nickel Balanced Tension · 11-15-19-28-37-50

D'Addario EXL115BT (11-15-19-28-37-50) in Eb standard on a 25.5" scale

11-50 Medium Balanced Tension, XL Nickel Electric Guitar Strings on an electric guitar with a 25.5" scale, tuned to Eb standard (Eb4 Bb3 Gb3 Db3 Ab2 Eb2), pulls 108.6 lb49.3 kg483 N in total and 18.1 lb8.21 kg80 N per string on average. That is a medium feel for an electric guitar. The set is very even (spread 2.6%). String 4 (Db3) deviates most: +4% from the set average.

Total tension: 108.6 lb49.3 kg483 N
Average per string: 18.1 lb8.21 kg80 N
Feel: medium; medium ≈ 17.1 lb7.76 kg76 N per string; Set your own preferred feel
Balance: very even; spread 2.6%

Tension per string

The bronze dashed line is the medium-feel target: the average per-string tension of a 10-46 set on a 25.5" scale in E standard (17.1 lb7.76 kg76 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	.011	PL011	plain	17.5 lb7.93 kg78 N	−3%
2	Bb3	233.1	.015	PL015	plain	18.3 lb8.29 kg81 N	+1%
3	Gb3	185.0	.019	PL019	plain	18.4 lb8.36 kg82 N	+2%
4	Db3	138.6	.028	NW028	wound	18.8 lb8.53 kg84 N	+4%
5	Ab2	103.8	.037	NW037	wound	18.0 lb8.17 kg80 N	−0%
6	Eb2	77.8	.050	NW050	wound	17.6 lb7.97 kg78 N	−3%
Total						108.6 lb49.3 kg483 N

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Similar sets in Eb standard, 25.5"

Set	Gauges	Avg per string	Total	Feel	Balance
D'Addario NYXL1149	11-14-18-28-38-49	17.4 lb7.87 kg77 N	104.1 lb47.2 kg463 N	medium	even
D'Addario EXL115	11-14-18-28-38-49	17.4 lb7.89 kg77 N	104.4 lb47.4 kg464 N	medium	even
D'Addario NYXL1052	10-13-17-30-42-52	17.7 lb8.04 kg79 N	106.4 lb48.2 kg473 N	medium	uneven
D'Addario EXL140	10-13-17-30-42-52	17.8 lb8.06 kg79 N	106.7 lb48.4 kg474 N	medium	uneven
EXL115BT (this page)	11-15-19-28-37-50	18.1 lb8.21 kg80 N	108.6 lb49.3 kg483 N	medium	very even
D'Addario EPN115	11-14-18-27-37-48	18.1 lb8.22 kg81 N	108.8 lb49.3 kg484 N	medium	moderately uneven

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

Ranked by how close every string is to 17.1 lb7.76 kg76 N (lower deviation is better).

D'Addario NYXL1149 11-14-18-28-38-49 deviation 6.3%, average 17.4 lb7.87 kg77 N, even; same gauges: EXL115
D'Addario EXL115BT 11-15-19-28-37-50 deviation 6.5%, average 18.1 lb8.21 kg80 N, very even
D'Addario EPN115 11-14-18-27-37-48 deviation 11.3%, average 18.1 lb8.22 kg81 N, moderately uneven

More for the EXL115BT

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

Eb standard on other scales: 24.75", 25", 26.5", 27", 28", 25.5"–27" multiscale

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 EXL115BT (2026-10-31): unit weights derived from the published tensions, cross-checked across sets.