Bra Size Calculator

Find your band and cup size from underbust and bust measurements.

Underbust / band (cm)

Bust / fullest point (cm)

Estimated size (EU)

75A

Last updated: 2026-08-31

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FAQ

How do I measure for a bra?

Measure snug under the bust for the band, then loosely around the fullest point while wearing an unpadded bra. The difference maps to the cup.

Why do brands disagree on my size?

Sizing charts vary between regions and manufacturers — treat this as a starting point and try the sister size (band up, cup down) too.

Is this the EU or US system?

It uses the EU convention of a rounded 5 cm band with 2 cm cup steps; US and UK cups letter differently above D.

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