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Old Navy to Uniqlo jeans size

The short answer

Old Navy 6 is Uniqlo 28 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 Old Navy size read across to Uniqlo. US numeric sizes on the left, Waist size on the right.
Old NavyOld Navy builds it forUniqlo, by chartSame labelUniqlo builds it forUniqlo also prints
00waist 24 in, hip 34.5 in24not publishedwaist 24 innot published
00waist 24 in, hip 34.5 in24not publishedwaist 24 innot published
2waist 26 in, hip 36.5 in26not publishedwaist 26 innot published
4waist 27 in, hip 37.5 in27not publishedwaist 27 innot published
6waist 28 in, hip 38.5 in28not publishedwaist 28 innot published
8waist 29 in, hip 39.5 in29not publishedwaist 29 innot published
10waist 30 in, hip 40.5 in30not publishedwaist 30 innot published
12waist 31.5 in, hip 42 in32not publishedwaist 32 innot published
14waist 33.5 in, hip 44 in34not publishedwaist 34 innot published
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 Uniqlo 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

Uniqlo to Old Navy