Bra Fitting Calculator

So many women are wearing the wrong size bra, and the high street gives very few options to get measured properly to fit modern bras. This calculator uses our algorithm to offer a starting size to then try bras. Using this, and our fit guides, you can try on bras knowing what should be happening to get your best fit.

Please enter your measurements below to calculate your Boob or Bust recommended Starting Size.

Dress size:
Tight : Inches How to measure
Snug : Inches How to measure
Standing : Inches How to measure
Leaning : Inches How to measure
Pregnant: No Yes Why do we need to know this?
Breastfeeding: No Yes Why do we need to know this?
Under 18: No Yes Why do we need to know this?
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We adjust our sizing method if you are pregnant to ensure you have space as your body grows. X If your nursling is under 8 weeks, Please contact the Boob or Bust admin via our Facebook page X We adjust our sizing method if you are under 18 to account for a growing body X
Your suggested starting size is
Band Size :

Cup Size :

For a fit check or further information about your suggested starting size, please visit Boob or Bust on Facebook

How To Measure

Tight With clothes and bra off, measure underneath your bust; measure it so tight that you think that the tape might snap.
Snug With clothes and bra off, measure underneath your bust tightly but still be able to get two fingers under the back. If you look at two fingers together, that's no more than an inch.
Standing Whilst standing up, measure around the fullest part of your bust (ensuring you don't squash nipples if included, though gently flattening them if very pronounced may be needed), whilst ensuring the tape is level all the way round.
Leaning Lean over so that your boobs are dangling at 90 degrees. Measure around the fullest part again.
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Disclaimer: The calculator and its coding are the property of Boob or Bust. They may only be reproduced with permission - please contact Boob or Bust via our Facebook page