Bra Size Calculator – Find Your Perfect Fit with Confidence
Wearing the right bra size is essential for comfort, support, posture, and confidence. Unfortunately, studies show that over 80% of women wear the wrong bra size, often due to confusion about sizing systems, fluctuating body changes, or inaccurate self-measurement. Our Bra Size Calculator simplifies this process by helping you determine your accurate bra size based on key measurements: band and bust.
This in-depth guide explains how bra sizing works, how to take your own measurements, how our calculator works, and how to choose the best style for your size and shape. Whether you’re shopping for everyday bras, maternity wear, or sports bras, this resource will help you find your true fit and feel more confident in your choices.
Why Bra Fit Matters
- Comfort: An ill-fitting bra can dig into your skin, slide off shoulders, or pinch your chest.
- Support: Especially important for larger busts to prevent back pain and improve posture.
- Confidence: When a bra fits well, it enhances your natural shape and makes clothes fit better.
- Health: Poorly fitted bras may lead to neck, shoulder, and even nerve pain.
Understanding Bra Sizes
Bra sizes are composed of two key elements:
- Band Size: This is the number part (e.g., 32, 34, 36) and refers to the circumference around your ribcage.
- Cup Size: This is the letter part (e.g., A, B, C) and represents the difference between your band size and your bust measurement.
A size 34B means the wearer has a 34-inch band size and a B cup (a 2-inch difference between band and bust).
How Our Bra Size Calculator Works
Our Bra Size Calculator simplifies the measuring process by guiding you through two quick steps:
- Band Measurement: Measure around your ribcage just under your bust.
- Bust Measurement: Measure around the fullest part of your bust.
The calculator then uses standard conversion formulas to determine your correct band and cup size, taking into account rounding rules and regional sizing standards (e.g., US, UK, EU).
How to Measure for Bra Size
Step 1: Measure Your Band Size
- Stand upright without a bra or with a non-padded bra.
- Wrap the measuring tape around your ribcage just under your bust, keeping it snug and level.
- Round to the nearest whole number.
If the number is even, add 4 inches. If it’s odd, add 5 inches. This gives you your band size.
Step 2: Measure Your Bust Size
- Wrap the tape around the fullest part of your bust.
- Ensure the tape is parallel to the floor and not too tight or loose.
- Round to the nearest whole number.
Step 3: Calculate the Cup Size
Subtract the band measurement from the bust measurement:
- 1" = A cup
- 2" = B cup
- 3" = C cup
- 4" = D cup
- 5" = DD/E cup
- 6" = DDD/F cup
- 7" = G cup
Example:
If your band measures 31", round to 32. Add 4 = 36 band size.
If your bust is 38", then 38 - 36 = 2" difference = B cup.
Your bra size is 36B.
International Bra Size Conversion Charts
Band Size Conversion
- US: 32, 34, 36, 38...
- UK: 32, 34, 36, 38...
- EU: 70, 75, 80, 85...
- France: 85, 90, 95, 100...
Cup Size Conversion
- US: A, B, C, D, DD, DDD...
- UK: A, B, C, D, DD, E...
- EU: A, B, C, D, E, F...
Always check the sizing system used by the brand you're shopping from.
Signs You're Wearing the Wrong Bra Size
- Straps slide off or dig into your shoulders
- The back band rides up or feels too tight
- Your breasts spill over or don’t fill the cups
- The center gore doesn’t sit flat against your chest
- You experience pain or discomfort after wearing it for a few hours
How Often Should You Recheck Your Bra Size?
- Every 6–12 months
- After significant weight change
- During/after pregnancy or breastfeeding
- As you age and body shape changes
Different Bra Styles and Their Best Uses
- T-Shirt Bra: Everyday wear, seamless look under clothing
- Push-Up Bra: Adds volume and cleavage
- Balconette Bra: Creates a lifted, rounded shape
- Wireless Bra: Comfort and flexibility
- Sports Bra: Reduces movement during activity
- Strapless Bra: Ideal for off-shoulder outfits
Common Bra Fitting Problems and Fixes
Problem: Band Too Tight or Loose
Solution: Adjust the band size. A snug but comfortable fit is ideal on the loosest hook.
Problem: Cups Gap or Spill Over
Solution: Go up or down a cup size. Check if the shape matches your breast type (full-on-top vs. full-on-bottom).
Problem: Underwire Digs In
Solution: Ensure the cup size is large enough and the wire fully encases breast tissue.
Tips for Buying Bras Online
- Know your exact measurements
- Check the sizing chart for each brand
- Read customer reviews for fit advice
- Opt for retailers with easy return policies
Breast Shapes and Bra Compatibility
- Asymmetric: Try bras with removable pads
- East-West: T-shirt bras help centralize
- Bell Shape: Full-coverage bras are ideal
- Round: Almost any style fits well
- Teardrop: Balconette bras enhance shape
Pregnancy and Nursing Bra Fit
- Choose soft, stretchy materials
- Allow extra space for growth
- Look for drop-down cups for easy nursing
FAQs – Bra Size Calculator
Q: Can I measure myself at home?
Yes. All you need is a soft measuring tape and a mirror. Make sure to measure without heavy clothing or padded bras.
Q: Should I wear a bra while measuring?
Wear a lightly lined, non-padded bra or go braless to get the most accurate results.
Q: How often should I replace bras?
Ideally every 6–12 months or after about 100 washes. Bras lose elasticity and support over time.
Q: Can my bra size change with weight loss or gain?
Yes. Even a few pounds of body weight change can affect band or cup size.
Q: What if my band and cup sizes are in different size systems?
Use conversion charts or select “international size” options in online stores to align regional differences.
Conclusion – Love Your Fit
Wearing the correct bra size transforms how you feel and look. Our Bra Size Calculator makes it easy to take the guesswork out of sizing, guiding you toward better comfort, support, and style. Whether you're replacing a daily staple or shopping for a special occasion, the right fit ensures you look and feel your best.
Take a few minutes to use the calculator, recheck your measurements, and browse styles made for your unique body. Once you understand your true size, shopping becomes less frustrating and far more empowering.
A well-fitted bra is not a luxury—it's a necessity. Start with accurate measurements and say goodbye to discomfort, constant adjusting, and sizing confusion. Find your perfect fit now!
