True & Co to Nike bra size

The short answer

True & Co XL is Nike 40C by the two brands' own charts.

Cups are counted along each brand's own letter order, and the band is carried across unchanged.

Every True & Co size read across to Nike. Brand's own sizes on the left, US on the right.
True & Co	Nike, by chart	Same label	Nike also prints
XS	32C	not published	not published
S	34C	not published	not published
M	36C	not published	not published
L	38C	not published	not published
XL	40C	not published	not published
1X	42C	not published	not published
2X	44C	not published	not published
3X	46C	not published	not published

Neither chart publishes the body each size is built for, so the rows line up the labels. 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

True & Co size guide, read on 2026-09-18. True & Co on TrueToSize
Nike size guide, read on 2026-09-18. Nike on TrueToSize

Nike to True & Co