How to Measure Your Bra Size

Knowing how to measure your bra size is the first step in your journey to finding the perfect bra. It's a fact that around 80% of people don't know their correct bra size, meaning that they're living in permanent discomfort from an ill-fitting bra, which is crazy! 

Unfortunately, knowing how to measure your bra size isn't the only part of your bra fitting journey: there are quite a few things you need to go through. Fortunately, I've put together a complete series of guides telling you what to do, and you can do it all from the comfort of your own home with minimal hassle. So, whilst bra fitting might seem a bit overwhelming, it doesn't have to be. Let's start with the most important part: how to measure your bra size.

How to Measure Your Bra Size

Most people think that measuring your bra size is a complicated process that requires a day trip out of the house, but it doesn't have to be this way. 

There's a simple answer to how to measure your bra size, and it goes like this. Your bra size is measured by your band size (which is the number) and your cup size (which is the letter). 

  • Take off your bra, grab a flexible tape measure and be sure to measure in inches.
  • Begin with the band. Take the tape around the rib cage, directly under the bust and keep it completely level (you should be able to get roughly two fingers under the back).
  • This measurement is your band size - but some brands vary in their measurements so always double-check (you can find our brand-specific size guides here). If it's an uneven number, try rounding up to the next even number and use this as your band size. For example, if your band measurement comes to 35.2 inches, round up to a 36 band size.
    how to measure your bra size
    • Now to the bust. Take a loose measurement over the fullest part of the bust, keeping the tape completely level around the body. Tip: take a deep breath in and out to make sure that the tape isn’t too tight.
    • Using these measurements, you can now calculate your bra size.
    how to measure your bra size


    Bust-to-Cup Calculator

    Using the bust-to-cup calculator below, you can figure out your bra size. It's as simple as taking your band measurement and subtracting your bust measurement from it. The difference between the two is your cup size.

    Always remember that sizing can vary from brand to brand, and it's super important to try on bras and measure them against a fit check to work out what fits you best. And that, ladies, is how to measure your bra size!

    bust to cup conversions

    How to Measure Your Bra Size: Sister Bra Sizes

    So, that's how to measure your bra size, but we're not finished there. If you've got a particularly awkward size or you find your dream bra and it's not offered in your size, it's time to head to sister bra sizes.

    Simply put, sister bra sizes are used in place of your regular size. They're not the same as wearing a bra that fits like a glove, but they are the closest fitting size you can get after that. So, if something isn't available in your size, you do have options!

    The rule is that if you go up a band size, you then go down a cup size. And vice-versa, if you go down one band size, you go up one cup size.

    how to measure your bra size sister bra sizes

    Bra Fitting, International Bra Sizing and Boob Shapes

    Now you've found out how to measure your bra size, you're ready for the next step in your journey to finding the perfect bra. 

    If you're not in the UK, you can head to the International Bra Size Converter here. You can either use your measurements to convert your size across the globe or, if you already know your international size, you can use that to convert to your UK size. At BraForMe, all of our bras are in UK sizes, so you need your UK measurements before you purchase anything.

    Your measurements are only half of the way to finding the right bra: you should also consider the shape. Have a read on How to Identify Your Boob Shape and what this means for your bras. 

    Once you're sorted with your measurements and shape, it's time to visit the guide on How Should a Bra Fit. Here, you'll find everything you need to make sure that your measurements lead to a perfectly-fitting bra, alongside what to try if your bra isn't fitting correctly. This can be used in combination with the guide on Types of Bras.

    Whilst this might seem like a lot to take in, it's really important to spend some time getting to know your boobs. You should look after and love your breasts, so investing time to find a bra that is going to support you and keep you comfortable is going to benefit you for the rest of your life (remember to check your sizing every six months - our bodies are always changing)!

     Any questions or want to chat? Contact us here.


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