Sister Size Calculator · UK
Bra Sister Size Calculator
Select your current UK bra size to instantly see all sister sizes — bras with the same cup volume but a different band.
30DD
Band 30 · Cup DD
Same volume
32D
Band 32 · Cup D
Same volume
34C
Band 34 · Cup C
Your Size
36B
Band 36 · Cup B
Same volume
38A
Band 38 · Cup A
Same volume
What are sister sizes?
Sister sizes share the same cup volume but have different band lengths. Going up a band size means going down a cup letter — and vice versa. This is useful when your preferred size is out of stock, or you need a different fit around the ribcage.
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