34B Across International Sizing Systems: US, UK, EU, JP Compared

Bra sizing is not universal -- a 34B in one country may be labeled completely differently elsewhere, even though the actual physical dimensions are the same. Understanding these international conversions helps when shopping from overseas brands or traveling.

US 34B and UK 34B are identical: a 34-inch band with a 36-inch bust (2-inch difference). In the European system, this converts to 75B (band measured in centimeters, with 75 cm equaling roughly 34 inches). French sizing uses 90B, which follows a different numbering convention. Japanese sizing marks it as 75B or sometimes 34B depending on the brand. Australian sizing labels it 12B.

A word of caution: even when the conversion is mathematically correct, fit can vary significantly between brands within the same labeled size. A French 90B from Empreinte may fit differently from a Japanese 75B from Wacoal due to differences in cup shape, wire width, and strap placement. Always try on international sizes before committing, or buy from retailers with generous return policies.

When in doubt, focus on your actual measurements in inches or centimeters rather than the label, and use brand-specific size charts rather than generic conversion tables.