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Good American to Gap jeans size

The short answer

Good American 15 Plus is Gap 18 by the two brands' own charts. 3 of 12 Good American sizes land on a different label at Gap.

Both brands publish the body waist each size is cut for, so every row matches a waist, not a tag.

Every Good American size read across to Gap. US numeric sizes on the left, US numeric on the right.
Good AmericanGood American builds it forGap, by chartSame labelGap builds it forGap also prints
00waist 24.5 in, hip 36 in00000waist 24.8 in, hip 34.3 inLetter XXS
00waist 24.5 in, hip 36 in00000waist 24.8 in, hip 34.3 inLetter XXS
2waist 26.5 in, hip 38 in22waist 26.5 in, hip 36.3 inLetter XS
4waist 27.5 in, hip 39 in44waist 27.5 in, hip 37.3 inLetter S
6waist 28.5 in, hip 40 in66waist 28.5 in, hip 38.3 inLetter S
8waist 29.5 in, hip 41 in88waist 29.5 in, hip 39.3 inLetter M
10waist 31 in, hip 42.5 in1010waist 30.5 in, hip 40.3 inLetter M
12waist 32.5 in, hip 44 in1212waist 32 in, hip 41.8 inLetter L
14waist 34 in, hip 45.5 in1414waist 33.5 in, hip 43.3 inLetter L
15 Pluswaist 37 in, hip 48 in18not publishedwaist 37.5 in, hip 47.3 inLetter XL
16 Pluswaist 39 in, hip 50 in20not publishedwaist 39.5 in, hip 49.3 inLetter XXL
18 Pluswaist 41 in, hip 52 in22not publishedwaist 41.5 in, hip 51.3 inLetter XXL
20 Pluswaist 43 in, hip 54 innot madenot publishednot publishednot published
22 Pluswaist 45 in, hip 56 innot madenot publishednot publishednot published
24 Pluswaist 47 in, hip 58 innot madenot publishednot publishednot published
26 Pluswaist 49 in, hip 60 innot madenot publishednot publishednot published
28 Pluswaist 51 in, hip 62 innot madenot publishednot publishednot published
30 Pluswaist 53 in, hip 64 innot madenot publishednot publishednot published
32 Pluswaist 55 in, hip 66 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 7 sizes have no counterpart on the Gap chart. Read from the two charts only; no formula and no averaging.

What wearers say

Charts describe a garment. People who own both brands describe a fit, and their answer ranks above this table once five of them stand behind it. Pick your size in the converter to see whether there are enough yet.

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Sources

Gap to Good American