Learning how to measure your bra size can seem boring, but knowing your measurements and have them accessible when the bra shopping mood strikes will make your life so much easier, especially for online shoppers.

All you need is a tape measure, wear your best fitting bra that's not padded and 60 seconds!

Best of all, knowing how to measure your bust will make adjusting to changes in your breasts (from losing or gaining weight, hormone fluctuations, aging, pregnancy, and more) so much less stressful.

Step 1:

Using a tape to measure around your rib cage directly under your bust and take the measurements that you get there, round to the nearest whole number. If the number is even, add four inches. If it’s odd, add five. Your band size is the sum of this calculation. 

Step 2: 

Wrap the measuring tape somewhat loosely around the fullest part of your chest (at nipple level). Round to the nearest whole number.

Step 3: 

Subtract the number for the fullest part of your breast from your rib cage and the result will be the inch difference.

 Example: 37 inches (bust) – 34 inches (band) = 3 inches. That’s a 34C.

Step 4: 

Use the chart below to figure out what cup size you are:




If bra sizes and finding the right size wasn’t hard enough, sizes change from country to country making the whole experience even more complicated.
If you want to learn more about the difference between UK and US sizes please take a look at our Bra Size Calculator
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