How to Determine Your Bra Size: A Step-by-Step Guide

Quick Answer

To determine your bra size, measure your band and bust with a soft tape, then calculate the difference. Our step-by-step guide walks you through the process, including common mistakes to avoid, so you can find a comfortable, supportive fit at home.

Finding the right bra size can feel like a puzzle, especially if you have a full bust. But with a few simple measurements, you can determine your size with confidence. Here's a practical, step-by-step guide to measuring yourself at home.

Whether you're shopping for a new bra or just want to check your current fit, these instructions will help you get accurate numbers. Plus, we'll point out common pitfalls so you can avoid them.

What You'll Need

Before you start, gather a soft measuring tape, a mirror, and wear a non-padded bra (or go braless) for the most accurate measurements. If you don't have a soft tape, use a piece of string and a ruler.

Make sure the tape is level and snug but not digging into your skin. It's best to measure in front of a mirror to ensure proper placement.

• Use a soft measuring tape for accuracy.
• Measure on bare skin or with a non-padded bra.

Step 1: Measure Your Band Size

Wrap the tape around your ribcage, directly under your bust. Keep it horizontal and snug. Take a deep breath and note the measurement in inches. If it's an odd number, round up to the nearest even number—this is your band size. For example, if you measure 31 inches, your band size is 32.

Common mistake: Measuring too loosely or too tightly. The tape should be comfortable but firm, similar to how you'd want your bra band to feel.

• Ensure the tape is parallel to the floor.

Step 2: Measure Your Bust Size

Wrap the tape around the fullest part of your bust, keeping it horizontal. Don't pull too tight—allow the tape to rest lightly. Round to the nearest whole number. This is your bust measurement.

Common mistake: Measuring over a padded bra or letting the tape dip in the back. Keep it level and consistent.

• Stand straight and breathe normally.

Step 3: Calculate Your Cup Size

Subtract your band size from your bust measurement. The difference in inches corresponds to your cup size: 1 inch = A, 2 inches = B, 3 inches = C, 4 inches = D, 5 inches = DD/E, and so on. For example, if your band is 36 and your bust is 40, the difference is 4 inches, so you're a D cup.

Common mistake: Forgetting that cup sizes vary by band. A 34D is not the same as a 36D, so always use your band size as the base.

• Use a bra size calculator to double-check.

Step 4: Check the Fit

Once you have your size, try on a bra and check the fit. The band should be level and snug on the loosest hook. The center gore should lie flat against your sternum, and the wires (if any) should encase your breast tissue without poking. Adjust the straps so they're snug but not digging in.

Common mistake: Choosing a band that rides up in the back—that means it's too loose. Also, if the cups wrinkle or spill over, the size is off.

• Move around to ensure the bra stays in place.

Step-by-Step: Measure Your Bra Size at Home

1. Measure your band: Wrap the tape snugly under your bust, round to the nearest even number. Checkpoint: The tape should be level and firm, not loose.
2. Measure your bust: Wrap the tape around the fullest part of your bust, keeping it horizontal. Checkpoint: Don't compress your breasts; let the tape rest lightly.
3. Calculate cup size: Subtract band from bust; each inch equals one cup size (1=A, 2=B, etc.). Checkpoint: Double-check with a bra size calculator.
4. Try it on: Test the bra on the loosest hook, ensure the gore lies flat and straps adjust. Verdict: If the band rides up or cups gap, adjust size accordingly.

Products That Support a Great Fit

• Elissa Full Bust Longline Strapless Bra - Black: This stylish, strapless, longline bra has light foam, smooth cups. Silicone elastic at the neckline and top back keeps the cups in place. If you're between sizes or want extra security, the longline design and silicone grip provide added support, making it easier to trust your measurements.
• Dalis Wire-Free Full Bust Bralette - Pearl White: Our softest and most comfortable wire-free bra ever! Features a super soft and cozy breathable cotton-like modal fabric, accented with a pretty lace trim. For lounging or sleep, this wire-free bralette offers comfort without compromising support, ideal for days when you want a break from underwires.

Measuring your bra size at home is straightforward with these steps. Remember to re-measure regularly, as your size can change. For a comfortable fit that supports your full bust, consider styles like the Elissa longline or Dalis wire-free bralette—both designed with your needs in mind.