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Guess to Old Navy jeans size

The short answer

Guess 28 is Old Navy 6 by the two brands' own charts.

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

Every Guess size read across to Old Navy. Waist size sizes on the left, US numeric on the right.
GuessGuess builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
23waist 23 in, hip 33.5 innot madenot publishednot publishednot published
24waist 24 in, hip 34.5 in00not publishedwaist 24 in, hip 34.5 inLetter XXS
25waist 25 in, hip 35.5 in0not publishedwaist 25 in, hip 35.5 inLetter XS
26waist 26 in, hip 36.5 in2not publishedwaist 26 in, hip 36.5 inLetter XS
27waist 27 in, hip 37.5 in4not publishedwaist 27 in, hip 37.5 inLetter S
28waist 28 in, hip 38.5 in6not publishedwaist 28 in, hip 38.5 inLetter S
29waist 29 in, hip 39.5 in8not publishedwaist 29 in, hip 39.5 inLetter M
30waist 30 in, hip 40.5 in10not publishedwaist 30 in, hip 40.5 inLetter M
31waist 31.5 in, hip 42 in12not publishedwaist 31.5 in, hip 42 inLetter L
32waist 33 in, hip 43.5 in14not publishedwaist 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 Guess