Finding the right bra can be a struggle—especially for plus-size women. A poorly fitted bra not only feels uncomfortable but can also affect your posture and confidence. If you've ever asked, "Why does my bra dig in?" or "Why does my chest spill out?"—chances are, you're wearing the wrong size. Knowing how to measure for a plus size bra correctly is the first step to getting the support and comfort you deserve.

We've compiled a guide to help you measure yourself at home, what you'll need, and how you can use those measurements to determine your ideal bra size.

Why Accurate Bra Measurements Matter

Plus-size bras are designed to offer enhanced support, but that support only works if the fit is right. Wearing the wrong bra size can lead to:

  • Shoulder and back pain

  • Skin irritation or chafing

  • Breast spillage or gaping

  • Poor posture

Getting an accurate measurement is key to finding bras that lift, support, and flatter your shape.

What You’ll Need

Before you begin, gather a few basic items:

  • A soft measuring tape (fabric type is ideal)

  • A mirror or a friend to help

  • A lightly lined, non-padded bra (optional but helpful for accuracy)

  • A notepad or phone to record your measurements

Step 1: Measure Your Band Size

The band is the foundation of any bra. To measure it:

  1. Stand upright and wrap the tape measure around your ribcage, just under your bust.

  2. Make sure the tape is snug but not tight and parallel to the floor.

  3. Round your measurement to the nearest whole number.

  4. If the number is even, add 4 inches. If it's odd, add 5 inches. This is your band size.

Example: If your underbust measures 37 inches, add 5 = 42. Your band size is 42.

Step 2: Measure Your Bust Size

Now, measure the fullest part of your bust:

  1. Wrap the tape around your chest at nipple level.

  2. Ensure the tape is straight across your back and not too tight.

  3. Breathe in and out, and take the measurement at the fullest point.

  4. Round to the nearest whole number.

Step 3: Calculate Your Cup Size

To find your cup size, subtract the band size from the bust size:

Bust size – Band size = Cup size difference

Use the difference to find your cup size:

  • 1 inch = A cup

  • 2 inches = B cup

  • 3 inches = C cup

  • 4 inches = D cup

  • 5 inches = DD or E cup

  • 6 inches = DDD or F cup

  • And so on...

Example: Bust = 47, Band = 42 → 47 - 42 = 5 → Cup size = DD
Your bra size would be 42DD.

Tips for the Perfect Plus Size Bra Fit

  • Avoid tight straps: Straps should be snug but not digging into your shoulders. If they are, it means your band isn't doing its job.

  • Check the center gore: The center panel between the cups should lie flat against your chest.

  • Look at the underwire: It should sit comfortably around your breast tissue without poking or pinching.

  • Adjust your band: A new bra should fit best on the loosest hook so you can tighten it as it wears out.

  • Try sister sizing: If the band feels too tight but the cups fit well, go up a band size and down a cup size (e.g., from 40DDD to 42DD).

Plus Size Bra Styles to Consider

Once you've measured correctly, you can explore bra styles that best suit plus-size figures. Popular options include:

How Often Should You Measure?

Your body can change due to weight fluctuations, hormonal shifts, or age. It's a good idea to measure your bra size every six months or at least once a year. Wearing the right bra size not only improves comfort but also enhances how your clothes fit and how confident you feel.

Final Thoughts

Knowing how to measure for a plus size bra ensures you find styles that support, shape, and flatter your body. You don’t need to visit a boutique or lingerie store—just a soft tape, a mirror, and a few minutes can change how you feel in your clothes. Use your new measurements to shop confidently, and always prioritize comfort and fit over fashion trends.

If you're shopping online, many websites now offer size calculators based on your bust and band measurements. Take the time to get the fit right—it’s the foundation of your wardrobe and your confidence.

Tagged: Bra