Find Your Size

Did you know, 80% of people are wearing the wrong-sized bra*? According to our survey, only 12% of people get their chest measured whenever they buy a new bra. This is SHOCKING!

Wearing the wrong sized or fit of bra can not only be uncomfortable, but it can also be bad for your body too, resulting in back and neck problems.

That's why we're using the Boob or Bust method of measuring your bust, so you can measure yourself at home for the most accurate fit.


Our measuring tape is non-stretchy, reusable, and super-accurate. It even has the below instructions on it, so you'll always know how to measure properly, wherever you are!

  • Step 1

    Order your measuring tape! Our Tyvek tape is non-stretchy and won't snap.

  • Step 2

    Take all of your clothing and bra off.

  • Step 3

    Measure underneath your bust, pulling the tape as tight as you possibly can.

  • Step 4

    Measure underneath your bust, with two fingers' worth of slack.

  • Step 5

    Measure around the widest part of your breasts, including nipples.

  • Step 6

    Lean forward 90 degrees and measure round your breasts again, taking care not to squeeze them!

Please enter your measurements below to calculate your Boob or Bust recommended Starting Size.
UK 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?
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 or Contact Us for a Zoom Fitting.
With clothes and bra off, measure underneath your bust and measure it so tight that you think that the tape might snap. This is your Tight measurement.
With clothes and bra off, measure underneath your bust tightly but still be able to get two fingers under the back. This is your Snug measurement. If you look at two fingers together, that's no more than an inch.
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. This is your Standing measurement.
Lean over so that your boobs are dangling at 90 degrees. Measure around the fullest part again. This is your Leaning measurement.
We adjust our sizing method if you are pregnant to ensure you have space as your body grows.
If your nursling is under 8 weeks, Please contact the Boob or Bust admins via their Facebook Page.
We adjust our sizing method if you are under 18 to account for a growing body

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 their Facebook page for more information.