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Old Navy to Ksubi jeans size

The short answer

Old Navy 00 is Ksubi 1 or 2 by the two brands' own charts. 8 of 9 Old Navy 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 Old Navy size read across to Ksubi. US numeric sizes on the left, US numeric on the right.
Old NavyOld Navy builds it forKsubi, by chartSame labelKsubi builds it forKsubi also prints
00waist 24 in, hip 34.5 in1 or 20waist 23.5 in, hip 34 inWaist size 23 · Letter XXS
00waist 24 in, hip 34.5 in1 or 20waist 23.5 in, hip 34 inWaist size 23 · Letter XXS
2waist 26 in, hip 36.5 in3 or 42waist 25.5 in, hip 36 inWaist size 25 · Letter XS
4waist 27 in, hip 37.5 in4 or 54waist 26.5 in, hip 37 inWaist size 26 · Letter S
6waist 28 in, hip 38.5 in5 or 66waist 27.5 in, hip 38 inWaist size 27 · Letter S
8waist 29 in, hip 39.5 in6 or 78waist 28.5 in, hip 39 inWaist size 28 · Letter M
10waist 30 in, hip 40.5 in7 or 810waist 29.5 in, hip 40 inWaist size 29 · Letter M
12waist 31.5 in, hip 42 in912waist 31.5 in, hip 42 inWaist size 31 · Letter L
14waist 33.5 in, hip 44 in11not publishedwaist 33.5 in, hip 44 inWaist size 33 · Letter XL
16waist 36.3 in, hip 46.5 innot madenot publishednot publishednot published
18waist 39 in, hip 49 innot madenot publishednot publishednot published
20waist 42 in, hip 51.5 innot madenot publishednot publishednot published
22waist 44.3 in, hip 53.8 innot madenot publishednot publishednot published
24waist 46.6 in, hip 56.1 innot madenot publishednot publishednot published
26waist 49 in, hip 58.5 innot madenot publishednot publishednot published
28waist 51.5 in, hip 61 innot madenot publishednot publishednot published
30waist 54 in, hip 63.5 innot madenot publishednot publishednot published
Tinted rows change label or sit between two sizes. 8 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 Old Navy