Bra Size Calculator
Find your perfect bra size with band and bust measurements.
Measurements
What is the Bra Size Calculator?
The Bra Size Calculator helps women find their exact, most comfortable bra fit. Because over 80% of women wear the wrong bra size, using accurate physical measurements to determine your correct band and cup size can eliminate back pain and discomfort.
How It Works (Formula)
The traditional fitting formula involves measuring the ribcage just beneath the bust and adding 4 or 5 inches to find the "Band Size". Then, you measure across the fullest part of the bust. The difference in inches between the bust and the band determines the "Cup Size" (e.g., 1 inch = A, 2 inches = B).
$$ \text{Cup Size} = \text{Bust Measurement} - \text{Calculated Band Size} $$
A simple differential equation used by professional fitters.
How to Use It
Take a soft measuring tape and measure snugly under your bust, and then loosely across the fullest part of your bust. Enter both measurements into the calculator to instantly reveal your true US or UK bra size.