Bra Size Calculator

Free bra size calculator: band, cup, sister sizes, labels.

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Bra Size Calculator turns underbust and bust measurements into a starting band and cup size. Supports quick or six-measurement modes, sister sizes, US/UK/EU/FR/AU conversions, and an optional try-on journal. Measurements stay on your device. A size to try—not a guarantee of fit.

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Peptide DeveloperFounderPinnedNov 1
Free on-device bra size calculator. Enter underbust and bust measurements in inches or cm for a starting band and cup, plus sister sizes and US/UK/EU/FR/AU labels. Measurements stay on your device. A size to try, not a guarantee of fit. Contact: Evan Brooks.