Bra Size Calculator
Enter your underbust and bust measurements below to find your bra size. Works for sizes from 30A to 48DD.
Calculate Your Size
Measure snugly around your ribcage, just below your bust.
Measure around the fullest part of your bust, keeping the tape level.
How Bra Sizing Works
1
Band Size
Your underbust measurement, rounded to the nearest even number. This is the number in your bra size (38, 40, 42...).
2
Cup Size
The difference between your bust and band measurements. Each inch = one cup size (1"=A, 2"=B, 3"=C, 4"=D, 5"=DD, 6"=E, 7"=F).
3
Your Bra Size
Combine band + cup for your size. If 42 band and 3" difference = 42C. Always check the size chart for fit.
Tips for Accurate Measurements
Use a soft, flexible measuring tape - not a metal one.
Wear a non-padded bra or measure without a bra for the most accurate bust measurement.
Stand up straight with arms relaxed at your sides.
Keep the tape snug but not tight for the underbust, and level for the bust.
Measure at the end of the day when your body is most relaxed.
Ask someone to help if you have difficulty reaching around your back.