Bra Size Conversion

Why Bra Size Conversion Is Confusing

Band numbers and cup letters look similar worldwide but follow different rules. A US 34D is not automatically a EU 75D or a UK 34D in every brand. Band labels map from centimeters or inches differently; cup progressions use unequal steps across systems. Our conversion tool translates starting sizes using established chart relationships while reminding you that brand-specific charts still win at checkout.

Many women report ordering the wrong international size online. Industry estimates often suggest that checking both converted label and retailer size guide reduces returns more than copying a single letter across regions.

Major Sizing Systems at a Glance

United States (US)

Band sizes are even numbers (32, 34, 36) derived from underbust inches with rounding conventions. Cups progress A, B, C, D, then DD, DDD/E, etc.

United Kingdom (UK)

Band often equals measured underbust in inches for many charts. Cups continue with double letters (DD, E, F, FF, G) without skipping the way some US charts do.

Europe (EU / EN)

Band labeled in centimeters (75, 80, 85). Cup steps often use 2 cm bust-band difference per letter in many charts.

France / Belgium / Spain (FR)

Band number roughly equals bust measurement in centimeters in some legacy charts—distinct from EU underbust labeling. Always read the brand origin.

Australia / New Zealand (AU)

Similar to UK for many brands with local retailer variations.

How to Convert Band Sizes

Start from your measured underbust in centimeters. EU 75 bands target roughly 73–77 cm underbust depending on brand tolerance. US 34 bands target roughly 30–32 inches underbust after sizing math. Conversion tables round to the nearest available label—your body may sit between labels. When torn, try both neighboring bands.

How to Convert Cup Sizes

Do not assume D means the same everywhere. Map cup by bust-minus-band difference in the target system, not by letter name alone. Our calculator performs this mapping; manual shoppers should use dual charts that list difference in inches and centimeters.

• Measure underbust and bust in one unit system consistently.
• Apply target region rules to both numbers.
• Cross-check with brand chart if available.

Common Conversion Pitfalls

• Confusing EU band with FR band numbering
• Stopping at DD without mapping further double letters in UK
• Ignoring half-band differences when centimeters convert to odd US bands
• Using dress size as bra band equivalent

Verification With Measurement

Conversion should agree with fresh measurements within one step. If translated size feels wrong across multiple brands, remeasure band and bust rather than forcing a label. See how to measure and measurement chart.

Shopping International Brands Online

• Read returns policy before multi-size orders
• Look for fit notes (“runs small in band”)
• Compare wire width and cup depth reviews
• Keep a personal log of brand-specific best sizes

When to Remeasure vs Convert

Convert when you know a good fit in one region and need another label for a purchase. Remeasure when body weight, pregnancy, or time has passed since your reference bra fit well.

Brand Variance Disclaimer

Even within one country, brands deviate. Conversion gets you to the fitting room or cart with reasonable accuracy—not perfection. Pair with conversion chart tables and our sister size calculator for fine tuning.

Regional Shopping Scenarios

Moving from the US to the UK or EU—or ordering from those markets while abroad—means revisiting both band and cup columns. Students, expats, and travelers often keep one saved note with measured cm underbust, cm bust, and three computed full sizes (US, UK, EU) to paste into retailer sites without redoing math each time.

Return Policies and Conversion Risk

International returns may cost shipping; converting carefully upfront saves money. Screenshot the size chart at purchase time in case the retailer updates it later during a return dispute. If converted size fails but neighbor size works, log the brand quirk for future orders.

Currency, Duties, and Size Together

International orders may charge import fees regardless of fit success. Factor total cost when ordering multiple sizes for try-on. A correct conversion that avoids one return cycle often pays for itself even if unit price matches domestic retailers.

Subscription Boxes and International Curated Fit

Subscription services may default to one country’s sizing. Provide measured cm and preferred US/UK/EU labels in profile notes. Convert subscription shipments using the same difference method rather than trusting stylist guesses alone.

Prefer a printable reference? Open the full international bra size conversion chart for side-by-side US, UK, and EU tables.

Regional Calculators for Conversion Users

• UK bra size calculator
• US bra size calculator
• Australian bra size calculator
• Canadian bra size calculator
• Marks & Spencer bra size guide

International Bra Size Conversion Chart

Use this chart as a quick reference when shopping from international brands. Always confirm fit, because brand grading can differ.