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Gap to Ksubi jeans size

The short answer

Gap 000 is Ksubi 1 or 2 by the two brands' own charts. 9 of 10 Gap sizes land on a different label at Ksubi.

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

On 3 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 Ksubi. US numeric sizes on the left, US numeric on the right.
GapGap builds it forKsubi, by chartSame labelKsubi builds it forKsubi also prints
000waist 24 in, hip 33.3 in1 or 20waist 23.5 in, hip 34 inWaist size 23 · Letter XXS
000waist 24 in, hip 33.3 in1 or 20waist 23.5 in, hip 34 inWaist size 23 · Letter XXS
000waist 24 in, hip 33.3 in1 or 20waist 23.5 in, hip 34 inWaist size 23 · Letter XXS
2waist 26.5 in, hip 36.3 in42waist 26.5 in, hip 37 inWaist size 26 · Letter S
4waist 27.5 in, hip 37.3 in54waist 27.5 in, hip 38 inWaist size 27 · Letter S
6waist 28.5 in, hip 38.3 in66waist 28.5 in, hip 39 inWaist size 28 · Letter M
8waist 29.5 in, hip 39.3 in78waist 29.5 in, hip 40 inWaist size 29 · Letter M
10waist 30.5 in, hip 40.3 in810waist 30.5 in, hip 41 inWaist size 30 · Letter L
12waist 32 in, hip 41.8 in9 or 1012waist 31.5 in, hip 42 inWaist size 31 · Letter L
14waist 33.5 in, hip 43.3 in11not publishedwaist 33.5 in, hip 44 inWaist size 33 · Letter XL
16waist 35.5 in, hip 45.3 innot madenot publishednot publishednot published
18waist 37.5 in, hip 47.3 innot madenot publishednot publishednot published
20waist 39.5 in, hip 49.3 innot madenot publishednot publishednot published
22waist 41.5 in, hip 51.3 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 4 sizes have no counterpart on the Ksubi 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

Ksubi to Gap