Bra Size Calculator
Find your correct bra size in UK, US, EU, French and Italian sizing. Enter your measurements in inches or centimetres for instant results.
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How to measure: Band — measure snugly around your ribcage directly under your bust. Bust — measure loosely around the fullest part of your chest.
About This Tool
What it does
Calculates your bra size from two measurements — band (under bust) and bust (fullest point). Shows your size in UK, US, EU, French/Spanish and Italian sizing simultaneously, plus sister sizes for a slightly different fit.
Who it's for
Anyone shopping for bras online, particularly from international retailers. Useful for converting between sizing systems when shopping from ASOS, Victoria's Secret, European brands or other global retailers.
Your privacy
All calculations happen in your browser. No measurements or personal data are stored or transmitted anywhere.
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Frequently Asked Questions
How do I measure my bra size?
Use a soft tape measure. Band: measure snugly around your ribcage under your bust. Bust: measure loosely around the fullest part of your chest. The difference between the two determines your cup size.
What are sister sizes?
Sister sizes have the same cup volume but different band and cup letter combinations. For example 34C, 32D and 36B are sister sizes. If a 34C is tight in the band, try 36B for a looser band with the same cup volume.
What is the difference between UK and US sizing?
UK and US sizes diverge at larger cups. UK uses DD, E, F, FF while US uses E, F, G, H for the same sizes. Band numbers are the same. This calculator shows both simultaneously.
How do EU bra sizes work?
EU band sizes are calculated by adding 15 to the UK band (UK 34 = EU 75). French/Spanish adds a further 15 (UK 34 = FR 85). Cup letters are the same across EU, FR and IT.
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