how to measure bra size

Band size of bra explained

Your bra size exists of two measurements. The cup size is determined by measuring the fullest part of your breasts. The band size of your bra is the result of measuring your underbust.

  • What band sizes can I choose from?
  • How to determine my band size?
  • What is my bra size?


What band sizes can I choose from?

There are about fourteen different band sizes available. Although not every brand has the whole range of band sizes 28 – 54. The smaller band size you need, the smaller your underbust is.

When you choose a bra the first thing you decide on is your band size. From there you choose your cup size. It could be your measurements are in between two band sizes. You could round up to the nearest whole number.

  • Your band size should be firm but not too tight.
  • When you wear your bra for some time the band should still feel firm but comfortable.
  • Do remember that the most support of your bra comes from the band.

Read more about measuring your bra in the bra size quide»


How to determine my band size?

For the band, measure directly under your bust. Hold the measuring tape horizontal, looking in a mirror will help.

My advice is to measure a couple of times and write down the outcome. It’s normal if you measure slightly different numbers because it depends on how tight you hold the measuring tape. By measuring a couple of times you’ll learn just by practicing.

measuring bra band size
Measuring your underbust

What is my bra size?

As I mentioned your bra size is the combination of two measurements.

  1. your underbust
  2. your bust size
how to measure bra size

When you have measured yourself all you have to do is to check a bra size chart or use a bra size calculator.

Depending on your measurements you can wear perfectly happy two different bra sizes. They are called sister sizes. For example, a 36C and a 38B could be the sister sizes of one woman. Another woman could have 36C and 34D as her sister sizes.

bra sister sizing example
Example of sister sizes

This happens when you go up a bandsize

You wear a bra 36C and want to go up a band size. You choose a band size 38. But when going up a band size the volume of the cups will change too. A 38C bra will have bigger cups, and broader set, than the bra in 36C.

If you want to keep the same cup size you should try 38B.

This happens when you go down a bandsize

You wear a bra 36C and want to go down a band size. You choose a band size 34. But when going down a band size the cups will change too. A 34C bra will have less cup volume than a bra in 36C.

If you want to keep the same cup size you should try 34D.

Different brands may be sized a bit differently. If you know your bra sister size you know easily what bra sizes to try.


Check your bra size now!
Bra size calculator AAA - C cups »
Bra size calculator D+ cups »


Bluebella band 30 - 40 | cup AA - G Shop now
Hunkemöller band 28 - 44 | cup AA - H Shop now
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Amazon uk band 28 - 54 | cup AA - J Shop now

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