Bras N Things to Nike bra size

The short answer

Bras N Things 12DD is Nike 34E by the two brands' own charts.

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

Every Bras N Things size read across to Nike. AU sizes on the left, US on the right.
Bras N Things	Nike, by chart	Same label	Nike also prints
12A	34A	not published	not published
12B	34B	not published	not published
12C	34C	not published	not published
12D	34D	not published	not published
12DD	34E	not published	not published
12E	34F	not published	not published
12F	34G	not published	not published
12G	not made	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. 1 sizes have no counterpart on the Nike 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.

Open in the converter Add an item you own

Sources

Bras N Things size guide, read on 2026-09-18.
Nike size guide, read on 2026-09-18. Nike on TrueToSize

Nike to Bras N Things