CUUP to Triumph bra size

The short answer

CUUP 34E is Triumph 75E by the two brands' own charts.

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

Every CUUP size read across to Triumph. US sizes on the left, EU on the right.
CUUP	CUUP builds it for	Triumph, by chart	Same label	Triumph builds it for	Triumph also prints
34A	not published	75A	not published	not published	UK A · US A · FR A · AU A
34B	not published	75B	not published	not published	UK B · US B · FR B · AU B
34C	not published	75C	not published	not published	UK C · US C · FR C · AU C
34D	not published	75D	not published	not published	UK D · US D · FR D · AU D
34E	not published	75E	not published	not published	UK DD · US DD · FR E · AU DD
34F	not published	75F	not published	not published	UK E · US DDD · FR F · AU E
34G	not published	75G	not published	not published	UK F · US G · FR G · AU F
34H	not published	75H	not published	not published	UK G · US H · FR H · AU G

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

CUUP size guide, read on 2026-09-17. CUUP on TrueToSize
Triumph size guide, read on 2026-09-18.

Triumph to CUUP