Bra Size Calculator

Finding the right bra size can be confusing because brands and fitting methods differ. Many people struggle to know whether a size feels right or how to convert measurements between units, and that can lead to uncomfortable fits or returns when shopping online.

The Bra Size Calculator estimates a likely band and cup size from two simple measurements: your underbust (band) and full bust. Enter both measurements in inches or centimetres, choose the unit, and the tool converts values and applies a common difference-based method to return an approximate size. The Bra Size Calculator is intended as a quick, practical estimate to help narrow sizes before trying clothing or seeking a professional fitting.

Use this calculator when measuring for new bras, shopping online, or tracking fit changes over time. Measuring carefully—standing relaxed and using a soft tape at breast level—improves accuracy. Remember sizing systems and padding vary, so treat the result as a starting point and consult a fitter for a precise match when possible.