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Bra Size Calculator – Calculates bra size from band and bust measurem...

The Bra Size Calculator calculates bra size from band and bust measurements. This Bra Size Calculator gives you a practical result for an everyday calculation — fast, in the browser, with no download or sign-up needed.

The formula behind this calculator: Band size rounds the underbust measurement to the nearest even number; cup size is based on the difference between bust and band. As a practical example: A 34-inch band with a 4-inch bust difference is roughly a 34D. All results are calculated instantly in your browser — no data is stored or transmitted.

Bra Size Calculator FAQ

What does the Bra Size Calculator calculate?

Calculates bra size from band and bust measurements.

Can I use this for planning purposes?

Yes — it's designed to give you a reliable ballpark for everyday decisions.

Is the result specific to my exact situation?

It's a general estimate using standard assumptions. Personal factors (specific brands, local prices, personal preferences) can shift the actual result.

Does this work on mobile?

Yes — fully responsive and optimised for smartphones, tablets, and desktop browsers.