Finding the right bra size can feel overwhelming, but it doesn’t have to be. Knowing how bra size is measured gives you the confidence to shop smarter, feel more comfortable, and support your body properly. Here’s everything you need to know.
Why Bra Size Matters
Wearing the correct bra size is about more than comfort—it affects posture, confidence, and even how your clothes fit. An ill-fitting bra can lead to shoulder pain, back strain, and skin irritation. That’s why accurate measurement is essential.
The Two Key Measurements
Bra sizing is based on band size (the number) and cup size (the letter). Here’s how to measure both at home:
Step 1: Measuring the Band Size
Wrap a soft measuring tape snugly around your ribcage, just under your bust.
Make sure the tape is parallel to the ground.
Round to the nearest whole number.
If the number is even, that’s your band size. If it’s odd, round up to the next even number.
Example: If your ribcage measures 31 inches, your band size is likely 32.
Step 2: Measuring the Bust Size
Place the measuring tape around the fullest part of your bust, keeping it level.
Don’t pull too tight—keep it comfortably fitted.
Round to the nearest whole number.
Step 3: Calculating the Cup Size
Subtract your band measurement from your bust measurement.
The difference determines your cup size:
| Difference (in inches) | Cup Size |
|---|---|
| 1 inch | A |
| 2 inches | B |
| 3 inches | C |
| 4 inches | D |
| 5 inches | DD/E |
| 6 inches | DDD/F |
Example: If your bust is 36 inches and your band is 32, the difference is 4. That means your bra size is 32D.
Common Mistakes When Measuring
Wearing a padded or push-up bra while measuring.
Holding the tape too loosely or too tightly.
Forgetting that bra sizing can vary between brands.
Pro Tips for the Perfect Fit
Always try on a bra before buying if possible.
The band should feel snug but not restrictive.
Straps should sit comfortably without digging in.
Cups should fully contain breast tissue without gaps or overflow.
Final Thoughts
Now that you know how bra size is measured, you can take control of your lingerie shopping experience. While home measurements are a great start, professional fittings can offer added accuracy—especially if you notice changes in your body due to weight fluctuations, pregnancy, or age.
The right fit can transform not just how you look, but how you feel.
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