How to Measure Your Bra Size Accurately at Home Guide

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Let’s be real — most of us have been wearing the wrong bra size for years. In fact, studies show that up to 80% of women are in the wrong size! That’s not just uncomfortable — it can lead to back pain, shoulder strain, and poor posture. But don’t worry: with this step-by-step guide, you’ll learn how to measure your bra size accurately at home — no fitting room stress needed.

Why Getting the Right Bra Size Matters

A well-fitting bra should feel like a second skin: supportive, invisible, and comfortable all day long. Too tight? You’re cutting off circulation. Too loose? You’re getting zero support. The key is accuracy — and that starts with proper measurement.

What You’ll Need

  • A soft measuring tape (the kind tailors use)
  • A mirror
  • A non-padded bra (or go braless)
  • Paper and pen to record numbers

Step 1: Measure Your Band Size

Wrap the tape snugly around your ribcage, just under your bust. Make sure it’s parallel to the floor and not too tight. If the number is even, add 4 inches. If it’s odd, add 5. This gives you your band size.

Step 2: Measure Your Bust Size

Now, wrap the tape around the fullest part of your bust — usually over the nipples. Keep the tape level and don’t suck in. This is your bust measurement.

Step 3: Calculate Your Cup Size

Subtract your band size from your bust size. Each inch equals one cup size. For example:

  • 1 inch = A cup
  • 2 inches = B cup
  • 3 inches = C cup
  • 4 inches = D cup
So if your band is 32 inches and your bust is 37 inches, the difference is 5 inches — that’s a 32DD bra size.

Bra Size Chart (US Standard)

Band Size Bust (Inches) Cup Size (Difference in Inches)
30 31–35 A to DD
32 33–37 A to DD
34 35–39 A to DD
36 37–41 A to DD
38 39–43 A to DD

Pro Tips for Accuracy

  • Measure in the evening — breasts can swell slightly throughout the day
  • Wear a non-padded bra or none at all
  • If you're between sizes, go with the tighter band and adjust with the hooks
  • Remember: band = support, cup = volume

Still unsure? Try on multiple sizes. A good fit means the band sits level, doesn’t ride up, and the cups don’t gape or spill. For more help, check out our full guide on how to find your perfect bra fit.