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Gap to Universal Standard jeans size

The short answer

Gap 000 is Universal Standard 00 by the two brands' own charts. 10 of 14 Gap sizes land on a different label at Universal Standard.

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

On 6 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 Gap size read across to Universal Standard. US numeric sizes on the left, US numeric on the right.
GapGap builds it forUniversal Standard, by chartSame labelUniversal Standard builds it forUniversal Standard also prints
000waist 24 in, hip 33.3 in0000waist 24 to 25 in, hip 34 to 35 inLetter 4XS
000waist 24 in, hip 33.3 in0000waist 24 to 25 in, hip 34 to 35 inLetter 4XS
000waist 24 in, hip 33.3 in0000waist 24 to 25 in, hip 34 to 35 inLetter 4XS
2waist 26.5 in, hip 36.3 in22waist 26 to 27 in, hip 36 to 37 inLetter 3XS
4waist 27.5 in, hip 37.3 in44waist 27 to 28 in, hip 37 to 38 inLetter 3XS
6waist 28.5 in, hip 38.3 in66waist 28 to 29 in, hip 38 to 39 inLetter 2XS
8waist 29.5 in, hip 39.3 in88waist 29 to 31 in, hip 39 to 40 inLetter 2XS
10waist 30.5 in, hip 40.3 in810waist 29 to 31 in, hip 39 to 40 inLetter 2XS
12waist 32 in, hip 41.8 in8 or 1012waist 29 to 31 in, hip 39 to 40 inLetter 2XS
14waist 33.5 in, hip 43.3 in1014waist 33 to 35 in, hip 42 to 44 inLetter XS
16waist 35.5 in, hip 45.3 in1216waist 35 to 37 in, hip 44 to 46 inLetter XS
18waist 37.5 in, hip 47.3 in1418waist 37 to 39 in, hip 46 to 48 inLetter S
20waist 39.5 in, hip 49.3 in1620waist 39 to 41 in, hip 48 to 50 inLetter S
22waist 41.5 in, hip 51.3 in1822waist 41 to 43 in, hip 50 to 52 inLetter M
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

Universal Standard to Gap