About this site

Bra Size Calculator Online is a free set of tools for working out what bra size to try. It is not run by a bra brand or a shop, and it does not sell bras.

Why it exists

Some bra size calculators are built to move you towards a shop's own stock, or give a single size with no explanation. This one shows its working, tells you when you are between sizes, and is open about what a tape measure cannot tell you.

Your privacy

Body measurements are personal. Every calculation runs in your browser, and your measurements are never sent to a server or stored. See the privacy policy for details.

How the information is checked

The formula, thresholds and sources are all published on how the calculator works. Sizing tables are tested automatically before each update goes live. The site has no fitting qualifications or reviews to point to, so the method is laid out for you to judge.

Found a mistake?

Email info@brasizecalculatoronline.com. Corrections to sizes or sources are especially welcome.

Nothing on this site is medical advice.