Unfortunately, bra sizes can’t be determined by one number; there are three main parts to measure to find the perfect bra. Band size, cup size and bust size are equally important. By finding these numbers, you can determine if those old bras hidden in your drawer simply don’t work for you anymore.

Band size

For all three measurements, you’ll need a measuring tape and a non-padded or lightly padded bra. Snugly wrap the measuring tape around your back and have it meet directly under your bust, then round down to the closest whole number. Make sure that the tape stays parallel to the ground while it wraps around; measuring at an angle will skew your number.

Look at the chart below to see how measurements are associated with a specific band size. Keep in mind that these are standard sizes, but we’ll of course accommodate with custom sizes.

Bust size 

To get this size, you’ll want to measure around your back and across the fullest part of your breast. Take into account that a bra should be loose enough so you can take deep breaths easily, so don’t wrap too tightly. If you get a number with a quarter or half inch, just round up to the nearest whole number.

Cup size 

This is where some math comes into play. Subtract your band size from your bust size and the remaining number should indicate if you’re an A, B, C, D, DD, or DDD, F or G cup. Just one inch can mean the difference between a B cup and C cup. These are also U.S. standard cup sizes, but these can vary between different brands and make bra shopping a bit more complicated.

Do your bras measure up?

Now with a more accurate representation of your true size, take a look at the bras you have now and consider if you need to shop for a better fit. Remember that bras are much more than size; there is comfort, style, and support to consider. Try out our fit calculator to see if your bras do their job well:

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