Bra Size Converter
Convert bra sizes between US, UK, EU, French, and Australian sizing systems. Includes sister size calculations to help find your perfect fit across international brands.
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Quickly find your equivalent bra size across US, UK, EU, French, and Australian sizing systems. Perfect for international shopping, understanding size conversions between brands, and finding sister sizes when your exact size is unavailable. Includes automatic band and cup mapping across all five systems.
Cross-System Sizing
Each sizing system uses its own band and cup combinations. The converter maps the selected band position to the corresponding band in every other system, then matches cup volume indices across systems. US and UK share the same band structure but differ at DD+ cups. EU uses centimeter-based bands, French uses a shifted centimeter scale, and AU uses a reduced band numbering. Band widths follow standard industry sizing: US/UK bands increase by 2 inches, EU by 5 cm, French by 5 cm with offset, and AU by 2 inches starting from a different baseline.
Fun Fact: Bra sizing was invented in 1935 by the U.S. bra manufacturer Warner's, who standardized cup sizes from A through D. Before that, bras were sold simply as small, medium, or large — and the lingerie industry has been arguing about sizing consistency ever since.
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