Bra Size Converter
UK · US · EU · AU
Shopping internationally or comparing UK to US sizes? Convert your bra size between all major international sizing systems instantly.
Convert Your Bra Size
Full International Bra Size Conversion Chart
All major band sizes with UK, US, EU, AU and FR equivalents.
| UK / AU | US | EU (cm) | FR / ES / BE | IT |
|---|---|---|---|---|
| 28 | 28 | 60 | 75 | 0 |
| 30 | 30 | 65 | 80 | 1 |
| 32 | 32 | 70 | 85 | 2 |
| 34 | 34 | 75 | 90 | 3 |
| 36 | 36 | 80 | 95 | 4 |
| 38 | 38 | 85 | 100 | 5 |
| 40 | 40 | 90 | 105 | 6 |
| 42 | 42 | 95 | 110 | 7 |
| 44 | 44 | 100 | 115 | 8 |
| 46 | 46 | 105 | 120 | 9 |
Cup Size Conversion Chart
| UK Cup | US Cup | EU Cup | AU Cup | FR Cup |
|---|---|---|---|---|
| AA | AA | AA | AA | AA |
| A | A | A | A | A |
| B | B | B | B | B |
| C | C | C | C | C |
| D | D | D | D | D |
| DD | DD | E | DD | E |
| E | DDD/F | F | E | F |
| F | F/G | G | F | G |
| FF | G/H | H | FF | H |
| G | H | I | G | I |
| GG | I | J | GG | J |
| H | J | K | H | K |
Expert Verified Conversion Math
Every conversion factor and international size equivalent is reviewed by certified professionals.
Eleanor Vance
Certified Bra Fitter & Lingerie Consultant
Over 12 years of professional fitting experience at leading UK lingerie retailers, including Bravissimo and Marks & Spencer. Specially certified in maternity, teen first-fit, and post-surgery supportive consultations.
Sizing Math & Rounding Logic
Our calculator implements the industry-standard **modern fitting method** rather than the obsolete "plus-4" retail formula. Band sizes are derived directly from snug ribcage measurements in inches (rounded to the nearest even number). Cup sizes are calculated using the precise 1-inch difference increments between fuller bust and underbust measurements (e.g. 4" = D, 5" = DD, 6" = E).
Sourced Claims & Studies
Medical and biomechanical research shows that up to **80% of UK women wear the wrong bra size**. According to breast health clinical research from the **University of Portsmouth (Department of Sport and Exercise Science)**, properly fitted encapsulation support reduces vertical breast movement by up to 59%, significantly preventing exercise-induced breast discomfort and cooper's ligament stretching.