Nike to Bras N Things bra size

The short answer

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

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

Every Nike size read across to Bras N Things. US sizes on the left, AU on the right.
Nike	Bras N Things, by chart	Same label	Bras N Things also prints
34A	12A	not published	UK A · US A · EU A · FR A
34B	12B	not published	UK B · US B · EU B · FR B
34C	12C	not published	UK C · US C · EU C · FR C
34D	12D	not published	UK D · US D · EU D · FR D
34E	12DD	not published	UK DD · US DD · EU E · FR E
34F	12E	not published	UK E · US DDD · EU F · FR F
34G	12F	not published	UK F · US F · EU G · FR G

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.

Open in the converter Add an item you own

Sources

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

Bras N Things to Nike