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G-Star RAW to Gap jeans size

The short answer

G-Star RAW 31 is Gap 12 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 G-Star RAW size read across to Gap. Waist size sizes on the left, US numeric on the right.
G-Star RAWG-Star RAW builds it forGap, by chartSame labelGap builds it forGap also prints
24waist 25.2 in, hip 30.7 in0 or 00not publishedwaist 25.5 in, hip 35.3 inLetter XS
25waist 26.2 in, hip 31.7 in2not publishedwaist 26.5 in, hip 36.3 inLetter XS
26waist 27.2 in, hip 32.7 in4not publishedwaist 27.5 in, hip 37.3 inLetter S
27waist 28.2 in, hip 33.7 in6 or 4not publishedwaist 28.5 in, hip 38.3 inLetter S
28waist 29.1 in, hip 34.7 in8 or 6not publishedwaist 29.5 in, hip 39.3 inLetter M
29waist 30.1 in, hip 35.6 in10 or 8not publishedwaist 30.5 in, hip 40.3 inLetter M
30waist 31.1 in, hip 36.6 in10 or 12not publishedwaist 30.5 in, hip 40.3 inLetter M
31waist 32.1 in, hip 37.6 in12not publishedwaist 32 in, hip 41.8 inLetter L
32waist 33.1 in, hip 38.6 in14not publishedwaist 33.5 in, hip 43.3 inLetter L
33waist 34.1 in, hip 39.6 in14not publishedwaist 33.5 in, hip 43.3 inLetter L
34waist 35 in, hip 40.6 in16not publishedwaist 35.5 in, hip 45.3 inLetter XL
35waist 36 in, hip 41.5 in16not publishedwaist 35.5 in, hip 45.3 inLetter XL
36waist 37 in, hip 42.5 in18not publishedwaist 37.5 in, hip 47.3 inLetter XL
38waist 39.2 in, hip 44.5 in20not publishedwaist 39.5 in, hip 49.3 inLetter XXL
40waist 41.3 in, hip 46.5 in22not publishedwaist 41.5 in, hip 51.3 inLetter XXL
42waist 43.5 in, hip 48.4 innot madenot publishednot publishednot published
44waist 45.7 in, hip 50.4 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 2 sizes have no counterpart on the Gap 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.

Open in the converterAdd an item you own

Sources

Gap to G-Star RAW