How to Measure Your Bra Size at Home

I think it’s safe to say we all know how a bra that isn’t the right fit can completely ruin an outfit or worse, an entire day!

The solution is finding and investing in a set of undergarments that are the right cut, fit, and size, but let’s be real, it’s not a simple solution.

Bra sizes can vary between different brands so the best option is to know your bra size by taking bust measurements. These simple measuring instructions will ensure a perfect fit in the band and in cup and can even help you find the right amount of support that you need.


Without a bra on, use a measuring tape to measure around your torso directly under your bust where your bra band would sit.

If the measurement number is even, add four inches. If it’s odd, add five. Your band size is the sum of this calculation. (So if you measured 32 inches, your band size is 36. If you measured 33 inches, your band size is 38.)


Wrap the measuring tape loosely around the fullest part of your chest and round it off to the nearest whole number.


You can do this by subtracting your calculated band size (Step 1) from your bust measurement (Step 2) and refer to the bra cup size chart here. Your bra size is your band size with your cup size. Example: 37 inches (bust) – 34 inches (band) = 3 inches. That’s a 34C.


If you need to go down a cup size for fit, go up one band size and vice versa. For example, if a 34C is too big for you in the cups, move to a 36B. You can use the chart to guide you make the correct decision.

Just note that not all brands have the same sizing so your size may change slightly depending on the brand or type of bra.

Just be patient as it is a trial and error process, but you will find the perfect fit.

Has this been helpful rubies? Let us know in the comments below x

Article inspired by:


Leave a Reply

51 thoughts on “How to Measure Your Bra Size at Home

  1. Yolanda M. says:

    This really helps me a lot because l always buy the wrong bra size all the time. It makes me feel uncomfortable as my breasts keep on falling out of the bra. Thank you Rubybox.

  2. Zvikomborero Gracious S. says:

    This information is very profound as moat of us struggle to to find a perfect fit when we go into the shops to buy a braa. Thanks so much l am sure it will help a lot more others.

  3. Tsitsi M. says:

    Thank you so much for this article Rubybox. I always struggle with the perfect bra size. I am going to try measuring myself. Hopefully I will get the measurements right. Thank you so much.

  4. Ntee M. says:

    Perfect bra size makes my day. Great tips the right brand ,size and measurements will definitely work wonders. I love woolies brand and the last longer great quality bra.#rubybox

  5. Annah teto R. says:

    Thank you
    Most of the time when I buy bra ‘s, i don’t do measurements I just buy according to my current bra, if the one that I have is starting to be small then I buy one size up, thank you for the tips I will now do the measurements before I buy. ♥️♥️

  6. Natasha S. says:

    This step by step has Definately been helpful in getting one’s perfect bra size. Great chart guide. Rubybox Amazing always posting articles we can do a great deal with☺