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Old Navy to Universal Standard jeans size

The short answer

Old Navy 2 is Universal Standard 0 by the two brands' own charts. 15 of 17 Old Navy sizes land on a different label at Universal Standard.

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

On 4 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 Universal Standard. US numeric sizes on the left, US numeric on the right.
Old NavyOld Navy builds it forUniversal Standard, by chartSame labelUniversal Standard builds it forUniversal Standard also prints
00waist 24 in, hip 34.5 in0000waist 24 to 25 in, hip 34 to 35 inLetter 4XS
00waist 24 in, hip 34.5 in0000waist 24 to 25 in, hip 34 to 35 inLetter 4XS
2waist 26 in, hip 36.5 in02waist 25 to 26 in, hip 35 to 36 inLetter 4XS
4waist 27 in, hip 37.5 in24waist 26 to 27 in, hip 36 to 37 inLetter 3XS
6waist 28 in, hip 38.5 in46waist 27 to 28 in, hip 37 to 38 inLetter 3XS
8waist 29 in, hip 39.5 in68waist 28 to 29 in, hip 38 to 39 inLetter 2XS
10waist 30 in, hip 40.5 in810waist 29 to 31 in, hip 39 to 40 inLetter 2XS
12waist 31.5 in, hip 42 in8 or 1012waist 29 to 31 in, hip 39 to 40 inLetter 2XS
14waist 33.5 in, hip 44 in1014waist 33 to 35 in, hip 42 to 44 inLetter XS
16waist 36.3 in, hip 46.5 in1216waist 35 to 37 in, hip 44 to 46 inLetter XS
18waist 39 in, hip 49 in1418waist 37 to 39 in, hip 46 to 48 inLetter S
20waist 42 in, hip 51.5 in1820waist 41 to 43 in, hip 50 to 52 inLetter M
22waist 44.3 in, hip 53.8 in2022waist 43 to 45 in, hip 52 to 54 inLetter M
24waist 46.6 in, hip 56.1 in2224waist 45 to 47 in, hip 54 to 56 inLetter L
26waist 49 in, hip 58.5 in2426waist 47 to 49 in, hip 56 to 58 inLetter L
28waist 51.5 in, hip 61 in2628waist 50 to 52 in, hip 59 to 61 inLetter XL
30waist 54 in, hip 63.5 in2830waist 53 to 55 in, hip 62 to 64 inLetter XL
Tinted rows change label or sit between two sizes. 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

Universal Standard to Old Navy