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Gap to Old Navy jeans size

The short answer

Gap 000 is Old Navy 00 by the two brands' own charts. 6 of 14 Gap sizes land on a different label at Old Navy.

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

Every Gap size read across to Old Navy. US numeric sizes on the left, US numeric on the right.
GapGap builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
000waist 24 in, hip 33.3 in0000waist 24 in, hip 34.5 inLetter XXS
000waist 24 in, hip 33.3 in0000waist 24 in, hip 34.5 inLetter XXS
000waist 24 in, hip 33.3 in0000waist 24 in, hip 34.5 inLetter XXS
2waist 26.5 in, hip 36.3 in2 or 42waist 26 in, hip 36.5 inLetter XS
4waist 27.5 in, hip 37.3 in4 or 64waist 27 in, hip 37.5 inLetter S
6waist 28.5 in, hip 38.3 in6 or 86waist 28 in, hip 38.5 inLetter S
8waist 29.5 in, hip 39.3 in8 or 108waist 29 in, hip 39.5 inLetter M
10waist 30.5 in, hip 40.3 in1010waist 30 in, hip 40.5 inLetter M
12waist 32 in, hip 41.8 in1212waist 31.5 in, hip 42 inLetter L
14waist 33.5 in, hip 43.3 in1414waist 33.5 in, hip 44 inLetter L
16waist 35.5 in, hip 45.3 in1616waist 36.3 in, hip 46.5 inLetter XL
18waist 37.5 in, hip 47.3 in16 or 1818waist 36.3 in, hip 46.5 inLetter XL
20waist 39.5 in, hip 49.3 in1820waist 39 in, hip 49 inLetter XL
22waist 41.5 in, hip 51.3 in2022waist 42 in, hip 51.5 inLetter XXL / 2X
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

Old Navy to Gap