Shopping for bras online can be confusing—especially when brands use different sizing systems. A 34D in the US is not the same as a 34D in the UK or EU.
This guide breaks down the differences so you’ll always know your size, no matter where you’re shopping.
Key Differences Between Sizing Systems
System
Band Sizing
Cup Progression
Best For
US
Even numbers (32, 34, 36)
A, B, C, D, DD, DDD, G
American brands
UK
Even numbers (32, 34, 36)
A, B, C, D, DD, E, F, FF, G
British brands (more consistent for larger cups)
EU
Centimeters (70, 75, 80)
A, B, C, D, E, F, G
European brands
Complete Conversion Chart
US Size
UK Size
EU Size
FR/BE Size
AUS/NZ Size
28A
28A
60A
75A
6A
30A
30A
65A
80A
8A
32A
32A
70A
85A
10A
34A
34A
75A
90A
12A
36A
36A
80A
95A
14A
32B
32B
70B
85B
10B
34B
34B
75B
90B
12B
36B
36B
80B
95B
14B
32C
32C
70C
85C
10C
34C
34C
75C
90C
12C
36C
36C
80C
95C
14C
32D
32D
70D
85D
10D
34D
34D
75D
90D
12D
36D
36D
80D
95D
14D
32DD
32DD
70E
85E
10DD
34DD
34DD
75E
90E
12DD
32DDD/F
32E
70F
85F
10E
34DDD/F
34E
75F
90F
12E
32G
32F
70G
85G
10F
34G
34F
75G
90G
12F
Important Notes
UK sizing uses double letters beyond DD (E, F, FF, G, GG, etc.) and is considered more consistent for larger cup sizes.
EU sizing uses centimeters for band sizes (e.g., 70, 75, 80) and uses single-letter cup progressions (A, B, C, D, E, F, G).
French/Belgian sizing adds 15 to the EU band size (e.g., EU 70 = FR 85).
Always use the same size system when converting—don’t mix US and UK cup letters.
Conclusion
Understanding international sizing is key to successful online bra shopping. Bookmark this guide for your next purchase!
