Bra Size Calculator

Calculate Your Bra Size with the new Lazeme Bra Size Calculator

A perfectly fitting bra or bikini top makes you look and feel amazing. Curves in the right place can transform your figure. Every woman is unique, so we offer lingerie and swimwear with all cup sizes from A-K.

Please use our quick and easy UK bra size calculator below to help you measure your bra size.  (Measurements are in inches)

Our website uses UK underband and cup sizing.  Please use the charts on our Size Guide to convert international sizing

Bra Measurements, Under Bust, Fullest Bust

Bra Size Calculator

Measure around your body just under your
breasts as in fig. 1 rounding up or down to
the nearest even number.

The measurement round the fullest part of
your breasts is your bust size as in fig. 2.



Recent Customer Feedback on our Bra Size Advice:

bra advice review 

Hints and Tips for finding the perfect fit bra.

  • Measuring with a tape is not an exact science when it comes to bra fitting but it is a good place to start.  We will talk later about how to tell if you are wearing the right size bra.

  • Quite often swim tops only have one size setting rather than the 3 hook and eye fastening you would normally find on a bra.  This means that the band size is particularly important to get correct for swimwear as there may not be adjustment in the band.

  • Remember, the band provides the essential support, not the straps, so keep the tape measure taut and level.  It should feel snug but not overly tight.

  • Band Size - When measuring for the perfect fit, always round up or down to the next even number.  For example: if your under bust measurement is 34 1/4 inches, round down to band size 34, and for 35 1/4 inches, round up to size 36.


  • Our Calculator will give you an estimated size to try.  We say 'try' this size first because not all bras and brands are made the same.  A perfectly fitting bra is how it feels.  It should provide day-long comfort and confidence, with a stunning silhouette.


Need further help?  Watch our Bra Fitting Video


How to tell if you are wearing the right size bra?  View our 6 Bra fitting secrets to check if your bra is too big or small, or just right!

Everybody's shape is different so experiment with different bra styles, too

ie. full cup, balcony, side support, plunge, etc.

Visit our other advice pages for further help:

View the Lazeme Bra Fit Guide to help find your perfect fit and the Bra Style Guide to determine which bra style will suit you best.

If you need any further assistance or advice please drop us an email at or call our friendly customer services team on 01536 330713 and we would be delighted to help.


Here's a fun video to explain some of the above:

Are You Wearing The Right Bra?

Posted by Buzz Feed Blue.