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Ksubi to Old Navy jeans size

The short answer

Ksubi 1 is Old Navy 00 by the two brands' own charts. 11 of 12 Ksubi sizes land on a different label at Old Navy.

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

On 1 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 Ksubi size read across to Old Navy. US numeric sizes on the left, US numeric on the right.
KsubiKsubi builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
0waist 22.5 in, hip 33 innot made00not publishednot published
1waist 23.5 in, hip 34 in00not publishedwaist 24 in, hip 34.5 inLetter XXS
2waist 24.5 in, hip 35 in00 or 02waist 24 in, hip 34.5 inLetter XXS
3waist 25.5 in, hip 36 in0 or 2not publishedwaist 25 in, hip 35.5 inLetter XS
4waist 26.5 in, hip 37 in2 or 44waist 26 in, hip 36.5 inLetter XS
5waist 27.5 in, hip 38 in4 or 6not publishedwaist 27 in, hip 37.5 inLetter S
6waist 28.5 in, hip 39 in6 or 86waist 28 in, hip 38.5 inLetter S
7waist 29.5 in, hip 40 in8 or 10not publishedwaist 29 in, hip 39.5 inLetter M
8waist 30.5 in, hip 41 in108waist 30 in, hip 40.5 inLetter M
9waist 31.5 in, hip 42 in12not publishedwaist 31.5 in, hip 42 inLetter L
10waist 32.5 in, hip 43 in12 or 1410waist 31.5 in, hip 42 inLetter L
11waist 33.5 in, hip 44 in14not publishedwaist 33.5 in, hip 44 inLetter L
12waist 34.5 in, hip 45 in14 or 1612waist 33.5 in, hip 44 inLetter L
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Old Navy 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

Old Navy to Ksubi