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Nike to Fabletics leggings size

The short answer

Nike XS is Fabletics XXS by the two brands' own charts. 6 of 11 Nike sizes land on a different label at Fabletics.

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

On 3 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 Nike size read across to Fabletics. Letter sizes on the left, Letter on the right.
NikeNike builds it forFabletics, by chartSame labelFabletics builds it forFabletics also prints
XXSwaist 21.3 to 23.5 in, hip 30.5 to 33 inXXSXXSwaist 24 to 25 in, hip 33 to 35 inUS numeric 00
XSwaist 23.5 to 26 in, hip 33 to 35.5 inXXSXSwaist 24 to 25 in, hip 33 to 35 inUS numeric 00
Swaist 26 to 29 in, hip 35.5 to 38.5 inSSwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
Mwaist 29 to 31.5 in, hip 38.5 to 41 inMMwaist 29 to 31 in, hip 39 to 41 inUS numeric 8-10
Lwaist 31.5 to 34.5 in, hip 41 to 44 inLLwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34.5 to 38.5 in, hip 44 to 47 inXLXLwaist 35 to 37 in, hip 45 to 47 inUS numeric 16-18
XXLwaist 38.5 to 42.5 in, hip 47 to 50 inXXL/1XXXL/1Xwaist 38 to 41 in, hip 48 to 51 inUS numeric 16-18
0Xwaist 40 to 43 in, hip 48 to 51 in2Xnot publishedwaist 41 to 43 in, hip 51 to 53 inUS numeric 20-22
1Xwaist 43 to 45.5 in, hip 51 to 54 in3XXXL/1Xwaist 43 to 45 in, hip 53 to 55 inUS numeric 24-26
2Xwaist 45.5 to 49 in, hip 54 to 57 in5X2Xwaist 47 to 49 in, hip 57 to 59 inUS numeric 32-34
3Xwaist 49 to 53 in, hip 57 to 61 in6X3Xwaist 49 to 51 in, hip 59 to 61 inUS numeric 36-38
4Xwaist 53 to 57 in, hip 61 to 65 innot made4Xnot publishednot published
Tinted rows change label or sit between two sizes. 1 sizes have no counterpart on the Fabletics 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

Fabletics to Nike