Bra Size Calculator

Calculate your bra size from band and bust measurements. Get US, UK, and EU sizes plus sister sizes.

Band Measurement

Bust Measurement

Tab to move between fields

US Bra Size

34C

Band Size34

Cup SizeC

UK Size34C

EU Size85C

Sister Size (smaller band)32D

Sister Size (larger band)36B

Bust-Band Difference3 in

How to Use This Calculator

Measure your underbust (band) and fullest bust measurements in inches.
Enter Band Measurement (in) and Bust Measurement (in) — use a soft measuring tape snug but not tight.
Review US Bra Size, Band Size, and Cup Size as primary outputs.
Check UK Size and EU Size if shopping international brands.
Use Sister Size Smaller and Sister Size Larger if your primary size is unavailable — same cup volume, different band.

What each input means

Band Measurement: Measure snugly around your ribcage, just under your bust.
Bust Measurement: Measure around the fullest part of your bust while wearing a non-padded bra.

Identify Input Parameters
Band Measurement = 34, Bust Measurement = 37 = 2 input(s) provided
Calculate US Bra Size
US Bra Size = `${usBand
34C = 34C
Calculate Band Size
Band Size
34 = 34
Calculate Cup Size
C = C

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