Size Guide
40DD Bra Size
Everything you need to know about bra size 40DD — measurements, sister sizes, international equivalents, and fit advice.
Measurements for 40DD
Underbust (Band)
39 to 41 inches (99 to 104 cm)
Full Bust
approximately 46 inches (117 cm)
40DD in Other Sizing Systems
US
40DD
UK
40DD
EU
90E
FR
105E
AU
18DD
Sister Sizes for 40DD
These sizes have the same cup volume as 40DD. Try them if the band feels too tight or too loose.
38DDD ↔ 40DD ↔ 42D
← Tighter band, bigger cup · Looser band, smaller cup →
Fit Tips for 40DD
DD cups need good band support. Make sure 80% of support comes from the band, not the straps.
If your 40DD bra is gapping at the top of the cup, the cup may be too large or the wrong shape — try a demi-cup or balconette. If the center gore doesn't sit flat, go up one cup size.
Not sure about your size? Measure yourself and double-check.
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