Bra Size Calculator

Step 1: Measure your underbust (band measurement) snugly.

Step 2: Measure your bust at the fullest point.

Step 3: Enter both measurements and select your unit.

Step 4: Get your recommended size and sister sizes for fit adjustment.

Bra size is determined using two measurements: your band size (underbust) and bust size.

Band Size Calculation: Band size = Underbust measurement (in inches) rounded to the nearest even number. For example, if your underbust is 31 inches, the band size rounds up to 32.

Cup Size Calculation: Cup Size = Bust measurement (in inches) - Band size The difference in inches corresponds to a cup letter: - 0 inches = AA - 1 inch = A - 2 inches = B - 3 inches = C - 4 inches = D - 5 inches = DD/E

Example: A 36-inch bust and 32-inch band give a difference of 4 inches, which translates to a D cup. Thus, the size is 32D.

Sister sizes can be found by going up a band size and down a cup size (e.g., 34C), or down a band size and up a cup size (e.g., 30DD).

The Bra Size Calculator helps you find your ideal bra size using two simple measurements: your underbust (band) and fullest part of your bust. It follows the standard US sizing system to provide an accurate starting point for achieving a comfortable fit.

Wearing the correct bra size is essential for daily comfort, adequate support, and good posture. Studies suggest that a significant number of women wear the wrong bra size, which can lead to shoulder slippage, digging straps, or inadequate support. Because bodies naturally change over time due to factors like weight fluctuation, exercise, or aging, it is generally recommended to measure yourself once or twice a year.

Please remember that while measurements provide a strong mathematical foundation, actual bra sizing can vary between brands and even different styles from the same manufacturer. Your calculated size should serve as your primary guide, with sister sizes offering flexibility when a particular bra style runs slightly large or small in the band.