Bra Calculator
Find your perfect bra size based on underbust and bust measurements.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator determines your bra size using two measurements in inches.
- Enter Underbust (ribcage, just below bust): a number between 20 and 50 inches.
- Enter Bust (fullest part of chest): a number between 20 and 60 inches.
- Click Calculate.
The result shows your band size (rounded to the nearest even number) and cup letter. The formula details are displayed below the result.
Tip: Use a soft measuring tape and measure snugly but not tightly.
Previous Results
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Frequently Asked Questions
Wrap a measuring tape snugly around your ribcage, just under your bust. Keep the tape parallel to the floor.
Band size is the measurement around your ribcage, while cup size is the difference between your bust and band measurements.
Bra sizes can vary between brands. Use this as a starting point and try on bras for the best fit.
