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Good American to Old Navy jeans size

The short answer

Good American 10 is Old Navy 12 by the two brands' own charts. 11 of 19 Good American sizes land on a different label at Old Navy.

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 Old Navy. US numeric sizes on the left, US numeric on the right.
Good AmericanGood American builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
00waist 24.5 in, hip 36 in00 or 000waist 24 in, hip 34.5 inLetter XXS
00waist 24.5 in, hip 36 in00 or 000waist 24 in, hip 34.5 inLetter XXS
2waist 26.5 in, hip 38 in2 or 42waist 26 in, hip 36.5 inLetter XS
4waist 27.5 in, hip 39 in4 or 64waist 27 in, hip 37.5 inLetter S
6waist 28.5 in, hip 40 in6 or 86waist 28 in, hip 38.5 inLetter S
8waist 29.5 in, hip 41 in8 or 108waist 29 in, hip 39.5 inLetter M
10waist 31 in, hip 42.5 in1210waist 31.5 in, hip 42 inLetter L
12waist 32.5 in, hip 44 in12 or 1412waist 31.5 in, hip 42 inLetter L
14waist 34 in, hip 45.5 in1414waist 33.5 in, hip 44 inLetter L
15 Pluswaist 37 in, hip 48 in16not publishedwaist 36.3 in, hip 46.5 inLetter XL
16 Pluswaist 39 in, hip 50 in18not publishedwaist 39 in, hip 49 inLetter XL
18 Pluswaist 41 in, hip 52 in20not publishedwaist 42 in, hip 51.5 inLetter XXL / 2X
20 Pluswaist 43 in, hip 54 in20 or 22not publishedwaist 42 in, hip 51.5 inLetter XXL / 2X
22 Pluswaist 45 in, hip 56 in22not publishedwaist 44.3 in, hip 53.8 inLetter 2X
24 Pluswaist 47 in, hip 58 in24not publishedwaist 46.6 in, hip 56.1 inLetter 3X
26 Pluswaist 49 in, hip 60 in26not publishedwaist 49 in, hip 58.5 inLetter 3X
28 Pluswaist 51 in, hip 62 in28not publishedwaist 51.5 in, hip 61 inLetter 4X
30 Pluswaist 53 in, hip 64 in30 or 28not publishedwaist 54 in, hip 63.5 inLetter 4X
32 Pluswaist 55 in, hip 66 in30not publishedwaist 54 in, hip 63.5 inLetter 4X
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

Old Navy to Good American