International Bra Size Converter
Select your known bra size and country standard below to convert your equivalent band and cup sizes across US/CA, UK, EU, FR, AU, and JP sizing conventions.
Bra Size Converter Tool
Entered Size: 34C (US/CA)
* International bra conversions are reference equivalents based on standard sizing matrices. Actual bra fit can vary between manufacturers, fabrics, and cup styles.
What is a Bra Size Converter?
A bra size converter is a tool that translates your known bra size from one national standard into another. Because manufacturers in North America, Europe, Australia, and Asia use different measurement systems for bands and cups, purchasing underwear across international brands often requires converting your size labels.
For example, a US band size 34 corresponds to a French 90 or an Australian 12, while cup progressions differ significantly between US and UK manufacturers starting at D cups.
US vs UK Sizing Differences
While US and UK band sizes use the same inch numbers (30, 32, 34, 36, 38, 40), their cup sizing progressions diverge after D cups:
| Cup Order Step | US Cup Label | UK Cup Label |
|---|---|---|
| 5th Cup Step | DD / E | DD |
| 6th Cup Step | DDD / F | E |
| 7th Cup Step | G | F |
| 8th Cup Step | H | FF |
Don't Know Your Starting Size?
If you are unsure of your baseline bra size or suspect your current bra doesn't fit properly, establish your size from home in three easy steps:
- Use our free Bra Size Calculator to compute your baseline starting size.
- Follow our step-by-step How to Measure Guide.
- Explore our comprehensive Bra Size Chart for full conversion matrices.
- Learn about cup volume transfer with our Sister Size Guide.