How to Measure Bra Size

How to Measure Your Bra Size, Plus a Chart & Calculator

If you’re reading this, you probably know as well as any other woman that finding your bra size isn’t as clear-cut as you once thought. Your bra size has likely changed throughout your life, which can happen for a number of reasons including fluctuating weight and having children.

Helping other women learn how to measure bra size is part of what got us here. By learning the different shapes, sizes, and measurements of millions of women, we created bras with unmatched comfort and support and put that community data to use in The Original Fit Quiz for women everywhere to find bras in their right size — no fitting rooms or sifting through store racks required.

In this article, we’re going to break down how to measure your bra size in three easy steps so that the next time you go bra shopping, you’ll have a better idea of what to look for when trying to find your best-fitting bra.

How to Measure Bra Size in 3 Steps

There’s much more to measuring your bra size than just grabbing a measuring tape and marking down a band size (if only it were that simple!). In the next three steps, we’ll go into measuring your band size, then your bust size, and lastly, your cup size.

Determining the correct – and most current – measurements for your band, bust, and cup will make it SO much easier for you to find bras that fit right, and fit you, no matter where you get your bras. Plus, with those measurements, you’ll finally get confirmation to toss out or donate those bras in your drawer that you’ve been keeping just to keep.

Step 1: Find Your Band Size

Make sure to wear a lightly-lined or unpadded bra before measuring your band size. Take out a measuring tape and wrap it snugly across your back, keeping it parallel to the ground, and measure directly under your bust. Round down to the nearest even number and note your band size.

Step 2: Measure Your Bust Size

Keep the measuring tape around your back at band level and measure across the fullest part of your chest, making sure to hold the measuring tape snugly against you and parallel to the ground. Take a few deep breaths to let the tape rest on its most comfortable position (but not too loose!). If it falls on the half-inch, just round up. That's your bust size!

Step 3: Determine Your Cup Size

Determining cup size is where things can get tricky because cup sizes can vary depending on the maker. The most common way to calculate your cup size is by subtracting your band size from your bust size and using the difference to find your cup size according to a bra size chart.

Bra Size Chart

It’s not uncommon to have different sized bras from one brand to another. That discrepancy happens because different bra sizes often have similar measurements with slight variations in cup and band sizes.  

So, let’s get down to the nitty-gritty of your bra size. Start with your current bra size and use the chart below to help refine your bra size estimation and fit.

Got your bra size?

Find your best-fitting bra now Start Shopping

Still unsure on your size?

Take the Original Fit Quiz to find your size Take the Quiz

The Original Bra Fit Quiz

True&Co. knows the importance of a good-fitting bra for maximum comfort and confidence, so we invented the first Bra Fit Quiz. Every woman is unique, and bra fit is not always as easy as band and bust measurements. We know there are many factors that go into finding the right bra size. Our fit quiz will ask you all the important questions about your current bra fit, your breast shape, and your favorite brands to provide personalized recommendations for the best three bras for you.

We listen to you to make better bras. Take the fit quiz and we'll suggest the bras for your shape and size in minutes.

Do You Have the Right Bra Size?

The only way to tell whether the bra size given to you by a bra size calculator and chart is right is to put it to the test. Try on bras in your size from different brands and see whether you get the same comfort and support from each one.

What the right fit feels like:

  • The straps stay put on your shoulders and don’t dig in.
  • The band sits snugly against your back on any hook, ideally the loosest one. There should only be enough room to slide one finger underneath the band.
  • The cups properly cover your breasts with no overflow or gaps.
  • The underwire sits comfortably under your breasts. 

You can also look at it the other way and determine whether you have the wrong bra size based on the tell-tale signs of a bad bra fit: cup gaps, straps and bands that are either too loose or tight, band riding up, etc. 

What the wrong fit feels like:

  • The straps dig into your shoulders leaving painful marks, or slide off, especially if they’re adjusted to the tightest fit.
  • The band feels too tight or loose, especially if it squeezes or rides up on the loosest hook or slides around on the tightest hook.
  • Your breasts overflow out of the cups or the cups have gaps.
  • The underwire sits on top of your breasts (not only uncomfortable, but defeats the whole purpose of an underwire!).

Either way, it won’t take you long to know whether you’ve got the right or wrong bra size. Good bras are comfortable and supportive. Sure, there are plenty of good bras out there, but on top of comfort and support, the best bras are also available in a wide range of sizes, styles, and designed for versatility – which can be hard to come by if you don’t know where to look. 

If you’re still unsure, our Fit Quiz is here 24/7 to help you find your best-fitting bras with personalized results for your top three bras. You’re just a few clicks away from discovering bra bliss and the community of women who helped create it.

The Five Types of Bras You Need

Every woman should own these essential bra types.

  • The Five Types of Bras You Need

    Every woman should own these essential bra types.


    Bralettes are the essential comfy bra without wires or molded cups and straps that can be thin or lacy. While it’s great for comfort, the simplicity of this type of bra means it doesn't offer much when it comes to support.

    Shop Bralettes
  • The Five Types of Bras You Need

    Every woman should own these essential bra types.

    Wireless Bras

    If you don't like the feeling of a wire and don't need the kind of support a wire offers, a wireless bra is perfect for you. This is a type of bra that comes in all bra types and sizes, you can wear every day with just about anything.

    Shop Wireless Bras
  • The Five Types of Bras You Need

    Every woman should own these essential bra types.

    T-Shirt Bras

    A T-Shirt bra is all about comfort. This bra style ensures a smooth silhouette under your tees, no gaping cups or diggin in bands allowed here.T-shirt bras are great with t-shirts, but this type of bra is also great under any top.

    Shop T-Shirt Bras
  • The Five Types of Bras You Need

    Every woman should own these essential bra types.

    Balconette Bras

    Balconette bras provides a subtle lift to enhance your natural shape and cleavage. The cups are designed to have a feminine, sexy look with little coverage. It’s a bra style that is ideal for low-cut tops and dresses.

    Shop Balconette Bras
  • The Five Types of Bras You Need

    Every woman should own these essential bra types.

    Strapless Bras

    Because strapless bras are, well, strapless, they support breasts with an underwire and help from silicone or a rubber lining to prevent slippage. They are perfect for wearing under dresses or tops with an exposed shoulder.

    Shop Strapless Bras

Shop True&Co. Favorites

    Latest Posts from Underneath It All