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Step 1: Measure Your Band Size
While wearing a non-padded bra, wrap a measuring tape snugly around your ribcage, just under your bust. Make sure the tape is level all the way around. Round to the nearest whole number. If the number is even, add 4 inches. If it’s odd, add 5 inches. This is your band size.
Step 2: Measure Your Bust Size
Wrap the measuring tape somewhat loosely around the fullest part of your chest (at nipple level). Round to the nearest whole number. This is your bust measurement.
Step 3: Calculate Your Cup Size
Subtract your band size (from Step 1) from your bust measurement (from Step 2). The difference in inches determines your cup size.
