You’ve probably tried on a bra and thought, “This isn’t the right size.” Maybe it was too tight, or maybe it was too loose. Or maybe you just didn’t feel like it fit your body type well.

We’ve all been there. So we decided to make this guide to help you learn how to calculate your Bra measurements! We’ll tell you exactly how to measure yourself so that when you shop for a new bra (or pantyhose), you’ll know exactly what to expect in terms of fit.


To measure your under bust, wrap the measuring tape around the widest part of your rib cage. You should be able to fit one finger between the measuring tape and your body. Do not pull it too tightly; this will result in an inaccurate measurement!


The most accurate way to determine your bra size is by measuring your breasts. This can be done with a flexible tape measure or a piece of string, but make sure it’s long enough for you to wrap around yourself twice.

Measure under your armpits and around the front of your body, keeping the tape measure straight across your back. Don’t pull it too tightly!

The number of inches from one end of this measurement gives you an idea of what cup size would fit best (if there were such things as cups).

For example: If you measured 32 inches under each arm and around at front/back level with no gap between them then this would indicate that you are probably somewhere between an A-cup and B-cup depending on how much space there is between those two points.

Bra measurements

when wearing clothes without any padding inside them (which would push everything together so effectively that even if we had access to an X-ray machine right now, we wouldn’t see anything except maybe some scar tissue from childhood surgeries).


  • To determine your cup size, you need to measure the fullest part of your breast.
  • Place the tape measure around your back, under your arms and across the fullest part of your breasts.
  • Round up to the nearest whole number.

Determine your band size

To determine your band bra sizing, measure around your rib cage, directly under the breasts. Add five inches to this measurement and then round up to the nearest whole number. This is your band size!

If you’re still unsure of what size bra to get or need help finding a specific style, check out our guide on how to buy bras online


If you’re still confused about how to measure for a bra sizing, don’t worry! We’ve created an easy-to-use calculator that does all of this work for you. Simply enter your measurements into the form below and our system will tell you exactly what size bra should fit best.

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