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Good American to Universal Standard jeans size

The short answer

Good American 10 is Universal Standard 8 by the two brands' own charts. 13 of 19 Good American sizes land on a different label at Universal Standard.

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

On 1 sizes the charts land two or more sizes from the same label. Brands do not measure the body the same way, so on those rows treat the chart answer and the same label as the two ends of a range.

Every Good American size read across to Universal Standard. US numeric sizes on the left, US numeric on the right.
Good AmericanGood American builds it forUniversal Standard, by chartSame labelUniversal Standard builds it forUniversal Standard also prints
00waist 24.5 in, hip 36 in0000waist 24 to 25 in, hip 34 to 35 inLetter 4XS
00waist 24.5 in, hip 36 in0000waist 24 to 25 in, hip 34 to 35 inLetter 4XS
2waist 26.5 in, hip 38 in22waist 26 to 27 in, hip 36 to 37 inLetter 3XS
4waist 27.5 in, hip 39 in44waist 27 to 28 in, hip 37 to 38 inLetter 3XS
6waist 28.5 in, hip 40 in66waist 28 to 29 in, hip 38 to 39 inLetter 2XS
8waist 29.5 in, hip 41 in88waist 29 to 31 in, hip 39 to 40 inLetter 2XS
10waist 31 in, hip 42.5 in810waist 29 to 31 in, hip 39 to 40 inLetter 2XS
12waist 32.5 in, hip 44 in10 or 812waist 33 to 35 in, hip 42 to 44 inLetter XS
14waist 34 in, hip 45.5 in1014waist 33 to 35 in, hip 42 to 44 inLetter XS
15 Pluswaist 37 in, hip 48 in12not publishedwaist 35 to 37 in, hip 44 to 46 inLetter XS
16 Pluswaist 39 in, hip 50 in14not publishedwaist 37 to 39 in, hip 46 to 48 inLetter S
18 Pluswaist 41 in, hip 52 in16not publishedwaist 39 to 41 in, hip 48 to 50 inLetter S
20 Pluswaist 43 in, hip 54 in18not publishedwaist 41 to 43 in, hip 50 to 52 inLetter M
22 Pluswaist 45 in, hip 56 in20not publishedwaist 43 to 45 in, hip 52 to 54 inLetter M
24 Pluswaist 47 in, hip 58 in22not publishedwaist 45 to 47 in, hip 54 to 56 inLetter L
26 Pluswaist 49 in, hip 60 in24not publishedwaist 47 to 49 in, hip 56 to 58 inLetter L
28 Pluswaist 51 in, hip 62 in26not publishedwaist 50 to 52 in, hip 59 to 61 inLetter XL
30 Pluswaist 53 in, hip 64 in28not publishedwaist 53 to 55 in, hip 62 to 64 inLetter XL
32 Pluswaist 55 in, hip 66 in28not publishedwaist 53 to 55 in, hip 62 to 64 inLetter XL
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

Universal Standard to Good American