Nike to Gap clothing size

The short answer

Nike L is Gap 12 or 14 by the two brands' own charts.

Both brands publish the body bust each size is cut for, so every row matches a bust, not a letter or a number.

Every Nike size read across to Gap. Letter sizes on the left, US on the right.
Nike	Nike builds it for	Gap, by chart	Same label	Gap builds it for	Gap also prints
XXS	bust 27.5 to 29.5 in, waist 21.3 to 23.5 in, hip 30.5 to 33 in	not made	not published	not published	not published
XS	bust 29.5 to 32.5 in, waist 23.5 to 26 in, hip 33 to 35.5 in	00	not published	bust 31.3 in, waist 24.8 in, hip 34.3 in	Letter XXS
S	bust 32.5 to 35.5 in, waist 26 to 29 in, hip 35.5 to 38.5 in	4	not published	bust 34.3 in, waist 27.5 in, hip 37.3 in	Letter S
M	bust 35.5 to 38 in, waist 29 to 31.5 in, hip 38.5 to 41 in	8 or 10	not published	bust 36.3 in, waist 29.5 in, hip 39.3 in	Letter M
L	bust 38 to 41 in, waist 31.5 to 34.5 in, hip 41 to 44 in	12 or 14	not published	bust 38.8 in, waist 32 in, hip 41.8 in	Letter L
XL	bust 41 to 44.5 in, waist 34.5 to 38.5 in, hip 44 to 47 in	16 or 18	not published	bust 42 in, waist 35.5 in, hip 45.3 in	Letter XL
XXL	bust 44.5 to 48.5 in, waist 38.5 to 42.5 in, hip 47 to 50 in	20 or 22	not published	bust 45.8 in, waist 39.5 in, hip 49.3 in	Letter XXL

Tinted rows change label or sit between two sizes. 1 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, not a fit. We do not collect fit reports for this category yet, so this table is the two brands' own claims and nothing more.

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Sources

Nike size guide, read on 2026-09-18. Nike on TrueToSize
Gap size guide, read on 2026-09-18. Gap on TrueToSize

Gap to Nike