Bra Size Calculator

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Shopping A free bra size calculator that converts underbust and full bust measurements into band and cup sizes, sister sizes, and US, UK, and EU equivalents in inches or centimeters.

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Editor's Review

For reference only

The tool keeps all measurements in the browser, so nothing is stored or submitted, which suits people who prefer not to share body data. Its sister-size and multi-region conversion output is more practical than a single size result, though the site offers little beyond the calculator itself. Best us

Site introduction

Bra Size Calculator is a single-purpose web tool built around one task: turning two body measurements into a usable bra size. There is no account system or stored profile, and the page states plainly that measurements remain in the browser. That narrow scope makes it fast to use and easy to trust for a quick check.

The core flow asks for a snug underbust and a level full-bust measurement, accepts either inches or centimeters, and returns a band and cup size. Beyond the primary result, it also shows sister sizes and conversions across US, UK, and EU sizing systems, which helps when shopping brands that label differently.

It is aimed at anyone who wants a starting reference before buying a bra, including people whose size has changed or who are ordering from unfamiliar brands. Because sizing varies between manufacturers, the output is best treated as a guide rather than a guarantee.

The page includes short measuring instructions that flag common errors, such as a loose underbust reading or an angled tape at the back. Following those steps before entering numbers will produce more reliable results than guessing from an old label.

Overall, it is a lean utility for a specific need: quick, private size estimation with cross-region conversion, without sign-up or stored data.