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Universal Standard to Gap jeans size

The short answer

Universal Standard 10 is Gap 14 by the two brands' own charts. 5 of 11 Universal Standard sizes land on a different label at Gap.

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

On 5 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 Universal Standard size read across to Gap. US numeric sizes on the left, US numeric on the right.
Universal StandardUniversal Standard builds it forGap, by chartSame labelGap builds it forGap also prints
00waist 24 to 25 in, hip 34 to 35 in00000waist 24.8 in, hip 34.3 inLetter XXS
00waist 24 to 25 in, hip 34 to 35 in00000waist 24.8 in, hip 34.3 inLetter XXS
2waist 26 to 27 in, hip 36 to 37 in22waist 26.5 in, hip 36.3 inLetter XS
4waist 27 to 28 in, hip 37 to 38 in44waist 27.5 in, hip 37.3 inLetter S
6waist 28 to 29 in, hip 38 to 39 in66waist 28.5 in, hip 38.3 inLetter S
8waist 29 to 31 in, hip 39 to 40 in8 or 108waist 29.5 in, hip 39.3 inLetter M
10waist 33 to 35 in, hip 42 to 44 in1410waist 33.5 in, hip 43.3 inLetter L
12waist 35 to 37 in, hip 44 to 46 in1612waist 35.5 in, hip 45.3 inLetter XL
14waist 37 to 39 in, hip 46 to 48 in1814waist 37.5 in, hip 47.3 inLetter XL
16waist 39 to 41 in, hip 48 to 50 in2016waist 39.5 in, hip 49.3 inLetter XXL
18waist 41 to 43 in, hip 50 to 52 in2218waist 41.5 in, hip 51.3 inLetter XXL
20waist 43 to 45 in, hip 52 to 54 innot made20not publishednot published
22waist 45 to 47 in, hip 54 to 56 innot made22not publishednot published
24waist 47 to 49 in, hip 56 to 58 innot madenot publishednot publishednot published
26waist 50 to 52 in, hip 59 to 61 innot madenot publishednot publishednot published
28waist 53 to 55 in, hip 62 to 64 innot madenot publishednot publishednot published
30waist 56 to 59 in, hip 65 to 68 innot madenot publishednot publishednot published
32waist 60 to 63 in, hip 70 to 73 innot madenot publishednot publishednot published
34waist 59 to 63 in, hip 69 to 73 innot madenot publishednot publishednot published
36waist 63 to 67 in, hip 73 to 77 innot madenot publishednot publishednot published
38waist 66 to 70 in, hip 76 to 80 innot madenot publishednot publishednot published
40waist 70 to 74 in, hip 80 to 84 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 11 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.

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Sources

Gap to Universal Standard