Nike to Berlei bra size

The short answer

Nike 34D is Berlei 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 Berlei. US sizes on the left, AU on the right.
Nike	Berlei, by chart	Same label	Berlei also prints
34A	12A	not published	not published
34B	12B	not published	not published
34C	12C	not published	not published
34D	12D	not published	not published
34E	12DD	not published	not published
34F	12E	not published	not published
34G	12F	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

Nike size guide, read on 2026-09-18. Nike on TrueToSize
Berlei size guide, read on 2026-09-18.

Berlei to Nike