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Reformation to Old Navy jeans size

The short answer

Reformation 30 is Old Navy 12 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 Reformation size read across to Old Navy. Waist size sizes on the left, US numeric on the right.
ReformationReformation builds it forOld Navy, by chartSame labelOld Navy builds it forOld Navy also prints
23waist 23.5 in, hip 34 in00not publishedwaist 24 in, hip 34.5 inLetter XXS
24waist 24.5 in, hip 35 in00 or 0not publishedwaist 24 in, hip 34.5 inLetter XXS
25waist 25.5 in, hip 36 in0 or 2not publishedwaist 25 in, hip 35.5 inLetter XS
26waist 26.5 in, hip 37 in2 or 4not publishedwaist 26 in, hip 36.5 inLetter XS
27waist 27.5 in, hip 38 in4 or 6not publishedwaist 27 in, hip 37.5 inLetter S
28waist 28.5 in, hip 39 in6 or 8not publishedwaist 28 in, hip 38.5 inLetter S
29waist 30 in, hip 40.5 in10not publishedwaist 30 in, hip 40.5 inLetter M
30waist 31.5 in, hip 42 in12not publishedwaist 31.5 in, hip 42 inLetter L
31waist 33.3 in, hip 43.8 in14not publishedwaist 33.5 in, hip 44 inLetter L
32waist 38.5 in, hip 49 in18not publishedwaist 39 in, hip 49 inLetter XL
33waist 39 in, hip 50 in18not publishedwaist 39 in, hip 49 inLetter XL
34waist 40 in, hip 51 in18not publishedwaist 39 in, hip 49 inLetter XL
35waist 41 in, hip 52 in20not publishedwaist 42 in, hip 51.5 inLetter XXL / 2X
36waist 42 in, hip 53 in20not publishedwaist 42 in, hip 51.5 inLetter XXL / 2X
38waist 44 in, hip 55 in22not publishedwaist 44.3 in, hip 53.8 inLetter 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 Reformation