Marks & Spencer to Triumph bra size

The short answer

Marks & Spencer 34DD 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 Marks & Spencer size read across to Triumph. UK sizes on the left, EU on the right.
Marks & Spencer	Triumph, by chart	Same label	Triumph also prints
34AA	75AA	not published	not published
34A	75A	not published	UK A · US A · FR A · AU A
34B	75B	not published	UK B · US B · FR B · AU B
34C	75C	not published	UK C · US C · FR C · AU C
34D	75D	not published	UK D · US D · FR D · AU D
34DD	75E	not published	UK DD · US DD · FR E · AU DD
34E	75F	not published	UK E · US DDD · FR F · AU E
34F	75G	not published	UK F · US G · FR G · AU F
34G	75I	not published	UK H · US I · FR I · AU H
34GG	75J	not published	not published
34H	not made	not published	not published
34J	not made	not published	not published
34K	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. 3 sizes have no counterpart on the Triumph 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.

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Sources

Marks & Spencer size guide, read on 2026-09-18.
Triumph size guide, read on 2026-09-18.

Triumph to Marks & Spencer