How to Find Correct Bra Cup Size

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First, let’s bust a huge myth. Cup size isn’t a fixed volume of tissue. A D cup on a small frame is totally different from a D cup on a larger frame.

Here’s the fun comparison: cup size is like a ratio, not a bucket size. It’s the difference between your ribcage and your bust. An A cup means about one inch of difference, a B cup is two inches, a C is three, and so on.

So, a 32D and a 36D hold very different amounts of breast tissue. The number (the band) changes the story of the letter. Crazy, right?

Step One: Grab a Soft Measuring Tape

You can do this in your pajamas. No gym required. You’ll need a fabric measuring tape—the kind tailors use.

First, measure your band size. Wrap the tape snugly around your ribcage, right under your bust. Keep it parallel to the floor and take a deep breath out.

Write that number down. If it’s an even number, add four inches. If it’s an odd number, add five. That’s your band size. (So, 29 inches becomes a 34 band; 30 inches becomes a 34 band too).

Step Two: Find the Magic Difference

Now, measure your bust. Stand up straight, and wrap the tape around the fullest part of your chest. Don’t squish or lift—just let it rest lightly.

This number is your bust measurement. The difference between this and the band size is your key. Let’s say your band is 34 inches, and your bust is 37 inches. That’s a three-inch gap.

How To Find The Right Bra Size! | Sports bra size chart, Bra size chart

One inch = A, two inches = B, three inches = C. You guessed it—you’re a 34C. It’s literally just subtraction with a chart.