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Under Armour to Fabletics leggings size

The short answer

Under Armour SM is Fabletics S by the two brands' own charts. 8 of 11 Under Armour 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 2 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 Under Armour size read across to Fabletics. Letter sizes on the left, Letter on the right.
Under ArmourUnder Armour builds it forFabletics, by chartSame labelFabletics builds it forFabletics also prints
XXSwaist 24.5 to 25.5 in, hip 33 to 34.5 inXXSXXSwaist 24 to 25 in, hip 33 to 35 inUS numeric 00
XSwaist 25.5 to 27 in, hip 34.5 to 36 inXSXSwaist 25.5 to 26.5 in, hip 36 to 37 inUS numeric 0-2
SMwaist 27 to 29 in, hip 36 to 38 inSnot publishedwaist 27 to 28 in, hip 37.5 to 38.5 inUS numeric 4-6
MDwaist 29 to 31 in, hip 38 to 40 inMnot publishedwaist 29 to 31 in, hip 39 to 41 inUS numeric 8-10
LGwaist 31 to 34 in, hip 40 to 43 inLnot publishedwaist 32 to 34 in, hip 42 to 44 inUS numeric 12-14
XLwaist 34 to 37 in, hip 43 to 46 inXLXLwaist 35 to 37 in, hip 45 to 47 inUS numeric 16-18
XXLwaist 37 to 40 in, hip 46 to 49 inXXL/1XXXL/1Xwaist 38 to 41 in, hip 48 to 51 inUS numeric 16-18
3XLwaist 40 to 43 in, hip 49 to 52 in2Xnot publishedwaist 41 to 43 in, hip 51 to 53 inUS numeric 20-22
1Xwaist 39 to 43.5 in, hip 47 to 50.5 in2XXXL/1Xwaist 41 to 43 in, hip 51 to 53 inUS numeric 20-22
2Xwaist 43.5 to 48.5 in, hip 50.5 to 54.5 in4X2Xwaist 45 to 47 in, hip 55 to 57 inUS numeric 28-30
3Xwaist 48.5 to 53 in, hip 54.5 to 58 in6X3Xwaist 49 to 51 in, hip 59 to 61 inUS numeric 36-38
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

Fabletics to Under Armour