Bra & Apparel Fit Size Calculator

Enter your underbust and bust measurements to get your band size, cup size, and equivalent sizes in US, UK, EU, FR/BE, AU, and Italian sizing.

Unit

Underbust (below bust)

Bust (fullest part)

Runs entirely in your browser. Nothing is uploaded or stored.

How it works

STEP 1

Wear a non-padded bra or none. Measure snugly around your ribcage, just below the bust. This gives your band size.

STEP 2

Measure around the fullest part of your bust, keeping the tape parallel to the ground and slightly loose.

STEP 3

We calculate band + cup size and show conversions for all major international sizing systems instantly.