Boob or Bust Bra 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.

How To Measure

You will need to take four measurements with a flexible tape measure. These are as follows:
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 With clothes and bra off, 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 required), whilst ensuring the tape is level all the way round.
Leaning With clothes and bra off, lean over at 90 degrees so that your boobs are dangling directly downwards. Measure around the fullest part again.

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

How to measure
UK Dress size:
Tight : Inches
Snug : Inches
Standing : Inches
Leaning : Inches
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Under 18? Why do we ask this?
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Your suggested starting size is

Band Size :

Cup Size :

Not sure where to look? Try our list of retailers
For a fit check or further information about your suggested starting size, please visit Boob or Bust on Facebook
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