Work out your US, UK and EU bra size from two tape measurements — underbust and bust — using the standard sizing chart.
Bra Size Calculator
Your US bra size
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UK size
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EU size
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How it works: The band size is your underbust measurement in inches, rounded up to the next even number. The cup letter comes from the difference between bust and underbust: under 1″ AA, 1″ A, 2″ B, 3″ C, 4″ D, 5″ DD/E, then one letter per extra inch. Measure snugly under the bust and loosely at the fullest point, standing straight. Sizing varies a little between brands, so treat this as a starting size to try.
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Estimates only — this tool is for general information and planning, not medical advice. If you have a health concern, please talk to a qualified clinician.