Bra Size Calculator

Calculate proper bra size from measurements.

Measure over fullest part of bust and snugly under bust for accurate sizing.

How to Do It Manually

Bra size is determined by band size (chest circumference) and cup size (difference between bust and band measurements). Measure in inches or cm.

Band Size = chest circumference (nearest whole inch), Cup = bust − band (each inch = 1 cup size: A=1", B=2", etc.)
  1. Measure directly under bust (band size).
  2. Measure fullest part of bust.
  3. Subtract band from bust.
  4. Each inch = 1 cup size (1"=A, 2"=B, 3"=C, 4"=D, etc.).

Frequently Asked Questions

How often should I get resized?

Annually, or after major weight changes. Band size can shift due to weight gain/loss.

Why is my size different at different stores?

Brands size differently. Fit is subjective; try on when possible.