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Old Navy to Gap jeans size

The short answer

Old Navy 00 is Gap 000 by the two brands' own charts. 9 of 12 Old Navy sizes land on a different label at Gap.

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 Gap. US numeric sizes on the left, US numeric on the right.
Old NavyOld Navy builds it forGap, by chartSame labelGap builds it forGap also prints
00waist 24 in, hip 34.5 in000000waist 24 in, hip 33.3 inLetter XXS
00waist 24 in, hip 34.5 in000000waist 24 in, hip 33.3 inLetter XXS
2waist 26 in, hip 36.5 in0 or 22waist 25.5 in, hip 35.3 inLetter XS
4waist 27 in, hip 37.5 in2 or 44waist 26.5 in, hip 36.3 inLetter XS
6waist 28 in, hip 38.5 in4 or 66waist 27.5 in, hip 37.3 inLetter S
8waist 29 in, hip 39.5 in6 or 88waist 28.5 in, hip 38.3 inLetter S
10waist 30 in, hip 40.5 in8 or 1010waist 29.5 in, hip 39.3 inLetter M
12waist 31.5 in, hip 42 in1212waist 32 in, hip 41.8 inLetter L
14waist 33.5 in, hip 44 in1414waist 33.5 in, hip 43.3 inLetter L
16waist 36.3 in, hip 46.5 in16 or 1816waist 35.5 in, hip 45.3 inLetter XL
18waist 39 in, hip 49 in2018waist 39.5 in, hip 49.3 inLetter XXL
20waist 42 in, hip 51.5 in2220waist 41.5 in, hip 51.3 inLetter XXL
22waist 44.3 in, hip 53.8 innot made22not 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. 5 sizes have no counterpart on the Gap 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

Gap to Old Navy