Size Guide
40D Bra Size
Everything you need to know about bra size 40D — measurements, sister sizes, international equivalents, and fit advice.
Measurements for 40D
Underbust (Band)
39 to 41 inches (99 to 104 cm)
Full Bust
approximately 45 inches (114 cm)
40D in Other Sizing Systems
US
40D
UK
40D
EU
90D
FR
105D
AU
18D
Sister Sizes for 40D
These sizes have the same cup volume as 40D. Try them if the band feels too tight or too loose.
38DD ↔ 40D ↔ 42C
← Tighter band, bigger cup · Looser band, smaller cup →
Fit Tips for 40D
D cups benefit from wider straps for comfort. Unlined bras can provide a more natural shape at this size.
If your 40D 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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