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Bra Size Calculator
Find your true bra size from band and bust measurements. Includes US, UK, EU sizes plus sister sizes for alternatives.
LIFESTYLEFind your true bra size from band (underbust) and bust measurements. Returns US, UK, and EU sizes plus sister sizes for finding alternatives when your main size does not fit a particular brand.
Band size = nearest even inch under your bust. Cup size = (bust - band) in inches: 1 = A, 2 = B, 3 = C, 4 = D, 5 = DD/E, 6 = DDD/F, 7 = G. Avoid the older "+4 method" - it almost always gives a band too loose. Sister sizes share cup volume but different bands: a 34C is the sister size of 32D (smaller band, one cup up) and 36B (larger band, one cup down).
Disclaimer: Sizing is a starting point - actual fit varies by brand and style. Many specialty shops offer free in-person fittings.
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Frequently Asked Questions
What is the Bra Size Calculator for?
Find your true bra size from band (underbust) and bust measurements. Returns US, UK, and EU sizes plus sister sizes for finding alternatives when your main size does not fit a particular brand.
How do I use the Bra Size Calculator?
Band size = nearest even inch under your bust. Cup size = (bust - band) in inches: 1 = A, 2 = B, 3 = C, 4 = D, 5 = DD/E, 6 = DDD/F, 7 = G. Avoid the older "+4 method" - it almost always gives a band too loose. Sister sizes share cup volume but different bands: a 34C is the sister size of 32D (smaller band, one cup up) and 36B (larger band, one cup down).
How accurate are my bra size results?
Sizing is a starting point - actual fit varies by brand and style. Many specialty shops offer free in-person fittings.
Is the Bra Size Calculator free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.
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