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About the Bra Size Calculator
This bra size calculator determines your band size and cup size from two body measurements. Enter your underbust and bust measurements, and it returns your size in US, UK, and EU sizing systems so you can compare labels across brands.
The calculator follows the standard bust-minus-band method used in most fitting guides. You need a soft measuring tape, your underbust measurement, and your bust measurement at the fullest point. The band size comes from the underbust rounded to the nearest even number, and the cup letter comes from the difference between bust and band in inches. Measure over a non-padded bra or bare skin, and keep the tape level and snug without compressing.
- Measure your underbust directly below the bust and note the number.
- Measure around the fullest part of your bust with the tape level.
- Enter both measurements, choose your unit, and read your size with international conversions.