How to Convert Bra Size to Bust Size and Band Size? [2025]

A perfect-fit bra is crucial for women’s breast support and comfort. But to find a perfect-fit bra, you must understand the bra size and how it works. A bra size has one counting number and one English alphabet representing your band size and bust size respectively.

Your band size and cup size are important in deciding which bra would suit you perfectly.Once you know how to convert bra size to bust size and band size, you can buy a supportive, stylish, and comfortable bra that will support your breasts throughout the day.

How to Convert Bra Size to Bust Size and Band Size?

If you wear the wrong size bra, it will cause you pain rather than support your breasts. That’s why it’s very important to calculate your bra size, band size, and cup size. In this article, I’ll tell you how to convert your bra size to bust size and band size.

Why do you need to convert Bra size to Bust size and Band size?

There are many reasons and benefits of converting your bra size to bust size and band size. Here are some of them:

  • If you know your exact band size and bra size, you can find your accurate size bra at any bra store without any problem because many bra brands have different measurement techniques so you must know your band and cup size to avoid buying a wrong size or shaped bra.
  • Your body and breast shape are unique from others. Once you know your shape, you can a supportive and stylish bra without any problem. You can even customize bras and tapes yourself if you know your body shape and health.
  • When you know your size, you can try a different sister-size bra and see if that suits you more comfortably. Sometimes, an exact bra can be a little tight and uncomfortable for some women. So you must once try a sister-size bra.
  • A perfect-fit bra will look good on you and it will compliment your body and breasts. It will give you comfort and support.
  • Knowing your bust and cup size, you can shop online for bras from any international bra brand.

Find Your Perfect Fit Today!

Discover the ideal bra size for your comfort and confidence with our easy-to-use Bra Size Calculator. Try it now!

Bra Size Calculator

How to Convert Bra size to Bust size and Band size?

Here’s the full guide on how you can convert your bra size to bust size and band size:

Band Size (The Number)

The number in your bra size represents your band size. If your bra size is 38C, then it means your band size is 38. You can measure it yourself using a tape and wrap it around your ribs under your cups (Busts) but make sure not to wrap it too tight or too loose for accurate measurement.

Bust Size (The Cups)

Your cup size would represent your bust size. For example, if your bra size is 38C, then your bust size would be 41 as C means the difference of 3.

You can measure your bust size by wrapping the tape on the fuller part of your cups. Whatever the measurement number comes on your tape, subtract it from your band size measurement.

If you’re unsure about conversions, check out Choosing the Best Bra for Your Breast Shape for guidance on adjusting sizes across different brands and regions.

Here are the cup size differences:

  1. The difference of 1 inch = A
  2. The difference of 2 inches = B
  3. The difference of 3 inches = C
  4. The difference of 4 inches = D

Cup Size Chart

Difference in (cm)UKUSEUFRAU
<1AAAAAAAAAA
1 (2.5)AAAAA
2 (5.1)BBBBB
3 (7.6)CCCCC
4 (10.2)DDDDD
5 (12.7)DDDD/EEEDD
6 (15.2)EDDD/FFFE
7 (17.8)FDDDD/GGGF
8 (20.3)FFHHHG
9 (22.9)GIIIH
10 (25.4)GGJJJI
11 (27.9)HKKKJ
12 (30.5)HHLLLK
13 (33.0)JMMML
14 (35.6)JJNNNM
15 (38.1)KOOON
16 (40.6)KKPPPO
17 (43.2)LQQQP
18 (45.7)MRRRLL

Some Tips for Finding a Perfect-Fit Bra

Here are some tips to help you find a perfect-fit bra:

  • You must regularly measure your bust size and band size at home because with time your body and breasts will change. There are many reasons for that such as aging, medical treatment, dieting, or pregnancy.
  • You should try a sister-size bra. If your bra size is 38C, you can try 39B and see if that fits you more comfortably.
  • A well-fitted bra would enhance your body posture and breast shape. It will also reduce your shoulder pain.

Frequently Asked Questions

How to convert bra size to band size and bust size?

You can easily convert your bra size to band size and bust size. For example, if your bra size is 35D, then your band size is 35 and your bust size is 39.

Can I measure my bra size at home?

Yes, you can measure your bra size at home using a measuring tape. Wrap the tape around your ribs under your bust to measure your band size. Then wrap the tape on your cups to measure your bust size. Now subtract your bust size from your band size. Match the resulting number with the Bra size chart.

How often should I measure my bra size?

You should measure your bra size every 6 to 8 months as your body can change with time.

Can wearing the wrong bra will affect me?

Yes, if you wear the wrong bra, it will affect your breast skin and cause you shoulder pain. Your bra should be neither too tight nor too loose.

Conclusion

If you understand your body measurements accurately, you can convert your bra size to bust size and band size. Thus, you can get a perfect-fit bra that will give you comfort, style, confidence, and support to your breasts.

All you have to do is just subtract your bust size from your band size and match the number in the cup size chart to determine your bra size.It’s a very easy process once you understand it perfectly. Now you can buy the online bar from your favourite brand without any hesitation.

Just select that bra that matches your size and shape. Thus with your bar size knowledge, you can shop anywhere and it will boost your confidence. Share this article with your fellow women and help them figure out how to convert their bra size to bust size and band size.

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