Bra Size Calculator (US/UK/EU)
- US size
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- UK size
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- EU size
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- FR/ES/BR size
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Band = underbust rounded to nearest even number (US) or +/−4″ method (UK older). Cup = bust − underbust difference.
About this tool
Bra Size Calculator (US/UK/EU) is a single-purpose utility on instant.tw, a free toolbox of calculators, converters, generators, and quick lookups. Everything works in your browser — nothing is uploaded, nothing is stored on a server unless explicitly noted.
Category: Sizing & Fit. Browse more Sizing & Fit tools.