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Gap to G-Star RAW jeans size

The short answer

Gap 12 is G-Star RAW 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 G-Star RAW. US numeric sizes on the left, Waist size on the right.
GapGap builds it forG-Star RAW, by chartSame labelG-Star RAW builds it forG-Star RAW 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 26.2 in, hip 31.7 innot published
4waist 27.5 in, hip 37.3 in26not publishedwaist 27.2 in, hip 32.7 innot published
6waist 28.5 in, hip 38.3 in27 or 28not publishedwaist 28.2 in, hip 33.7 innot published
8waist 29.5 in, hip 39.3 in28 or 29not publishedwaist 29.1 in, hip 34.7 innot published
10waist 30.5 in, hip 40.3 in29 or 30not publishedwaist 30.1 in, hip 35.6 innot published
12waist 32 in, hip 41.8 in31not publishedwaist 32.1 in, hip 37.6 innot published
14waist 33.5 in, hip 43.3 in32 or 33not publishedwaist 33.1 in, hip 38.6 innot published
16waist 35.5 in, hip 45.3 in34 or 35not publishedwaist 35 in, hip 40.6 innot published
18waist 37.5 in, hip 47.3 in36not publishedwaist 37 in, hip 42.5 innot published
20waist 39.5 in, hip 49.3 in38not publishedwaist 39.2 in, hip 44.5 innot published
22waist 41.5 in, hip 51.3 in40not publishedwaist 41.3 in, hip 46.5 innot published
Tinted rows change label or sit between two sizes. 3 sizes have no counterpart on the G-Star RAW 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

G-Star RAW to Gap