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Gap to Good American jeans size

The short answer

Gap 000 is Good American 00 by the two brands' own charts. 7 of 14 Gap sizes land on a different label at Good American.

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

Every Gap size read across to Good American. US numeric sizes on the left, US numeric on the right.
GapGap builds it forGood American, by chartSame labelGood American builds it forGood American also prints
000waist 24 in, hip 33.3 in0000waist 24.5 in, hip 36 innot published
000waist 24 in, hip 33.3 in0000waist 24.5 in, hip 36 innot published
000waist 24 in, hip 33.3 in0000waist 24.5 in, hip 36 innot published
2waist 26.5 in, hip 36.3 in22waist 26.5 in, hip 38 innot published
4waist 27.5 in, hip 37.3 in44waist 27.5 in, hip 39 innot published
6waist 28.5 in, hip 38.3 in66waist 28.5 in, hip 40 innot published
8waist 29.5 in, hip 39.3 in88waist 29.5 in, hip 41 innot published
10waist 30.5 in, hip 40.3 in1010waist 31 in, hip 42.5 innot published
12waist 32 in, hip 41.8 in1212waist 32.5 in, hip 44 innot published
14waist 33.5 in, hip 43.3 in1414waist 34 in, hip 45.5 innot published
16waist 35.5 in, hip 45.3 in14 or 15 Plusnot publishedwaist 34 in, hip 45.5 innot published
18waist 37.5 in, hip 47.3 in15 Plusnot publishedwaist 37 in, hip 48 innot published
20waist 39.5 in, hip 49.3 in16 Plusnot publishedwaist 39 in, hip 50 innot published
22waist 41.5 in, hip 51.3 in18 Plusnot publishedwaist 41 in, hip 52 innot published
Tinted rows change label or sit between two sizes. 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

Good American to Gap