Bra Cup Size Calculator
Find your most comfortable fit using your exact measurements in inches.
Your estimated bra size is:
How to Measure Your Bra Size at Home
Wearing the wrong bra size isn't just uncomfortable; it can lead to back pain, poor posture, and skin irritation. Our Bra Cup Size Calculator uses the modern fitting method to provide an accurate starting point for your lingerie shopping.
Step 1: Measure Your Underbust
Exhale and wrap a soft measuring tape snugly around your ribcage, directly under your breasts. Keep the tape level and parallel to the ground.
Exhale and wrap a soft measuring tape snugly around your ribcage, directly under your breasts. Keep the tape level and parallel to the ground.
Step 2: Measure Your Bust
Wrap the tape around the fullest part of your chest. Do not pull it tight; it should rest gently against your skin without compressing the tissue.
Wrap the tape around the fullest part of your chest. Do not pull it tight; it should rest gently against your skin without compressing the tissue.
Understanding the Calculation
The calculation for bra size consists of two main components:
- Band Size: This is determined by your underbust measurement. Most modern manufacturers use your actual ribcage measurement rounded to the nearest even number.
- Cup Size: This is the volume difference between your bust and your band. For every inch of difference, you go up one cup letter.
Common Bra Size Examples
If your underbust is 32 inches and your bust is 34 inches, the 2-inch difference indicates a 32B. If your bust was 37 inches, the 5-inch difference would indicate a 32DD (or 32E in some brands).
Fitting Tips
Remember that a calculator is a starting point. Brands vary in their manufacturing. You'll know you have the right fit when:
- The band is level all the way around your body.
- The center gore (the piece between the cups) sits flat against your chest.
- There is no "spillage" over the tops or sides of the cups.
- The straps don't dig in but stay securely on your shoulders.