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Fabletics to Under Armour leggings size

The short answer

Fabletics S is Under Armour SM by the two brands' own charts. 9 of 12 Fabletics sizes land on a different label at Under Armour.

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

On 1 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 Fabletics size read across to Under Armour. Letter sizes on the left, Letter on the right.
FableticsFabletics builds it forUnder Armour, by chartSame labelUnder Armour builds it forUnder Armour also prints
XXSwaist 24 to 25 in, hip 33 to 35 inXXSXXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inUS numeric 00
XSwaist 25.5 to 26.5 in, hip 36 to 37 inXSXSwaist 25.5 to 27 in, hip 34.5 to 36 inUS numeric 0-2
Swaist 27 to 28 in, hip 37.5 to 38.5 inSMnot publishedwaist 27 to 29 in, hip 36 to 38 inUS numeric 4-6
Mwaist 29 to 31 in, hip 39 to 41 inMDnot publishedwaist 29 to 31 in, hip 38 to 40 inUS numeric 8-10
Lwaist 32 to 34 in, hip 42 to 44 inLGnot publishedwaist 31 to 34 in, hip 40 to 43 inUS numeric 12-14
XLwaist 35 to 37 in, hip 45 to 47 inXLXLwaist 34 to 37 in, hip 43 to 46 inUS numeric 16
XXL/1Xwaist 38 to 41 in, hip 48 to 51 inXXLnot publishedwaist 37 to 40 in, hip 46 to 49 inUS numeric 18
2Xwaist 41 to 43 in, hip 51 to 53 in3XL2Xwaist 40 to 43 in, hip 49 to 52 inUS numeric 20
3Xwaist 43 to 45 in, hip 53 to 55 in2X3Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
4Xwaist 45 to 47 in, hip 55 to 57 in2Xnot publishedwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
5Xwaist 47 to 49 in, hip 57 to 59 in2Xnot publishedwaist 43.5 to 48.5 in, hip 50.5 to 54.5 inUS numeric 20W-22W
6Xwaist 49 to 51 in, hip 59 to 61 in3Xnot publishedwaist 48.5 to 53 in, hip 54.5 to 58 inUS numeric 24W-26W
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

Under Armour to Fabletics