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Gap to Wrangler jeans size

The short answer

Gap 12 is Wrangler 31 by the two brands' own charts.

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 Wrangler. US numeric sizes on the left, Waist size on the right.
GapGap builds it forWrangler, by chartSame labelWrangler builds it forWrangler also prints
000waist 24 in, hip 33.3 innot madenot publishednot publishednot published
000waist 24 in, hip 33.3 innot madenot publishednot publishednot published
000waist 24 in, hip 33.3 innot madenot publishednot publishednot published
2waist 26.5 in, hip 36.3 in25not publishedwaist 26 to 26.5 in, hip 34.5 to 35 inUS numeric 0 · Letter XS
4waist 27.5 in, hip 37.3 in26not publishedwaist 27 to 27.5 in, hip 35.5 to 36 inUS numeric 1/2 · Letter XS
6waist 28.5 in, hip 38.3 in27not publishedwaist 28 to 28.5 in, hip 36.5 to 37 inUS numeric 3/4 · Letter S
8waist 29.5 in, hip 39.3 in28not publishedwaist 29 to 29.5 in, hip 37.5 to 38 inUS numeric 5/6 · Letter S
10waist 30.5 in, hip 40.3 in29not publishedwaist 30 to 30.5 in, hip 38.5 to 39 inUS numeric 7/8 · Letter M
12waist 32 in, hip 41.8 in31not publishedwaist 32 to 33.5 in, hip 40.5 to 41.5 inUS numeric 11/12 · Letter L
14waist 33.5 in, hip 43.3 in32not publishedwaist 33.5 to 34.5 in, hip 42 to 43 inUS numeric 13/14 · Letter L
16waist 35.5 in, hip 45.3 in33not publishedwaist 35 to 36.8 in, hip 43.5 to 44.5 inUS numeric 15/16 · Letter XL
18waist 37.5 in, hip 47.3 in34not publishedwaist 36.8 to 38.5 in, hip 45 to 46.5 inUS numeric 17/18 · Letter XL
20waist 39.5 in, hip 49.3 in35not publishedwaist 39 to 40.8 in, hip 47 to 48.5 inUS numeric 19/20 · Letter XXL
22waist 41.5 in, hip 51.3 in36not publishedwaist 41.3 to 43 in, hip 49 to 50.5 inUS numeric 22W · Letter XXXL
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the Wrangler 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

Wrangler to Gap