How To Accurately Measure Your Bra Size

Okay, let's be real for a second. You and your bra have been through a lot together. But have you ever actually, like, measured it?

I’m talking about a real measurement, not “I bought this in 2019 and it kind of works.”

Here’s the sad truth: 80% of us are wearing the wrong size. That’s a statistic that should make you gasp—and adjust your straps.

So grab a soft measuring tape and a friend (or a very patient mirror). We’re about to change your life.

First, ditch your current bra. Yes, even your “comfy” one. You need to be naked from the waist up.

Step 1: The Band Size (The Power Move)

Wrap the tape measure around your rib cage, right under your bust. It should be snug—like a firm hug, not a boa constrictor.

Make sure the tape is level all the way around your back. No diagonal cheating.

Write down that number in inches. If it’s an odd number, round up to the next even number. That’s your band size.

Congrats! You just found the most important part. The band does 80% of the heavy lifting.

Step 2: The Bust Measurement (The Tricky Part)

Now measure around the fullest part of your chest. This is usually right over the nipple. Don’t squish the girls!

Keep the tape comfortably loose—not tight, not loosey-goosey. Think: a gentle drape.

Write that number down too. This is your bust measurement.

Now for the math you can do in your head (I promise). Subtract your band size from your bust measurement.

That number tells you your cup size. One inch = A. Two inches = B. Three inches = C. Four inches = D. Five inches = DD.

So if your band is 34 and your bust is 38, you’re a 34D.

Wait, That’s Not Right? Let’s Troubleshoot.

Feel like you’re between sizes? Join the club. It’s normal.

If the band rides up your back, it’s too big. Go down a band size and up a cup size. That’s called “sister sizing.”

If your straps are digging trenches into your shoulders, the band is too loose. The straps should do almost nothing—the band is the real boss.

That “Swoop and Scoop” Move You Keep Hearing About

Once you try on a bra, you have to do the ritual. Lean forward slightly.

Swoop all your breast tissue from under your armpits into the cup. Then scoop upward.

Straighten up. You should look like you just got a free lift. That’s the correct fit.

If you spill over the top or sides, the cup is too small. If you have gaping fabric at the top, it’s too big.

Why Bother With All This?

Because a well-fitting bra changes everything. Your clothes fit better. Your back hurts less.

And you stop having to yank at your straps like a malfunctioning robot in public.

Also, you deserve to feel supported. Not suffocated. Not saggy. Actually supported.

One more thing: your size changes. Weight loss, weight gain, pregnancy, even the time of month—all of it matters.

So measure yourself at least once a year. Set a calendar reminder if you have to.

And for the love of all that is comfy, don’t buy bras based on the size you wish you were. Buy the size that actually fits.

You wouldn’t wear shoes three sizes too small for three years. Why do that to your chest?

Now go forth. Measure. Swoop. Scoop. And never suffer through another underwire stab again.

Your boobs will literally thank you.