Measure underbust and overbust into a bra band and cup size.
The underbust rounds to the nearest even band, and the difference from the overbust sets the cup letter. An ill-fitting band carries most of the support, so a correct number prevents straps and discomfort.
Bra Band Size
Band = underbust rounded to even; cup = overbust - band
Band = underbust rounded to even; cup = overbust - band The underbust rounds to the nearest even band, and the difference from the overbust sets the cup letter.
An ill-fitting band carries most of the support, so a correct number prevents straps and discomfort.
This calculator takes 2 inputs: Underbust, Overbust. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.