Understanding your calculation
Method, example and limitations
How the calculation works
Bra-size estimates compare underbust and bust measurements within a regional sizing system. Band and cup labels should be interpreted together.
Example to check
A cup letter does not describe a fixed volume independently of band size. Changing the band while keeping the same letter changes the fit.
Before using the result
Sizing systems and brands differ. Tape placement, posture and style affect the estimate; use fitting guidance rather than treating one result as a universal size.