DD Cup Size Guide
DD cup (double D) represents a 5-inch bust-band difference. It's a full cup size that requires structured support and is sometimes labeled as E in European sizing.
Quick Facts: DD Cup
Bust-Band Difference
5 inches (12.5 cm)
Approx. Volume (34 band)
~600-750 ml
UK Equivalent
DD
EU Equivalent
E
Common DD Cup Sizes
DD Cup Works Best For
- ✓Full-busted individuals
- ✓Those prioritizing support
- ✓Active lifestyles needing high support
- ✓Professional settings
Common Challenges
- !Limited mainstream availability
- !Finding attractive supportive styles
- !Shoulder and back strain without proper fit
Best Bra Styles for DD Cup
Sister Sizes for DD Cup
Sister sizes have the same cup volume with different band sizes. If your band feels too tight or loose, try a sister size.
Tighter Band
32E
Your Size
34DD
Looser Band
34D
Frequently Asked Questions: DD Cup
Is DD the same as E cup?
In US sizing, DD and E are often used interchangeably. In UK sizing, DD comes before E, with E being one cup size larger. Always check the brand's sizing system.
Why is it called double D?
DD originated as 'double D' in American sizing as an extension beyond the original A-D range. It represents the next size after D rather than literally being 'twice' a D.
What's the best bra for DD cups?
Look for bras with three-part cup construction, wide straps (at least 1 inch), a firm band, and side boning or support panels for DD cups.
Find Your Perfect DD Cup Bra
Use our calculator to confirm your size and get personalized recommendations.