Bra Size Calculator

Calculate bra size from band and bust measurements.

Band Size (in)

Bust Size (in)

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Guides & Reference

How It Works

Calculate bra size from band and bust measurements. Enter your values and press Calculate for instant results with a full formula breakdown.

Formula

Cup = Bust - Band

Common calculations — results you can verify instantly.

Under 36in, Bust 38in

Diff=2 inches

Approx 36B

Under 34in, Bust 38in

Diff=4 inches

Approx 34D

Sister sizes

Same cup volume

34C = 36B = 32D

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