Understanding Bra Size Conversion
Our bra size converter helps you find equivalent sizes across US, UK, EU, and international sizing systems. Perfect for shopping from international lingerie brands or understanding global size differences.
How Bra Sizing Works
Bra sizes consist of a band size (number) and cup size (letter). The band measures ribcage circumference, while the cup measures breast volume relative to band size. Different countries use different numbering and lettering systems, making conversion essential for international shopping.
Common Use Cases
Real-world applications for this calculator
International Shopping
Shop from European lingerie brands like Victoria's Secret, Agent Provocateur, or local boutiques.
Understanding Fit
Compare sizes when trying different brands with varying fit standards.
Size Changes
Find sister sizes when your usual size is unavailable.
Tips
- Get professionally fitted at least once for baseline measurements.
- Try the scoop and swoop method when putting on a bra.
- The band should be snug on the loosest hook when new.
- Check fit regularly as weight and body composition change.
Frequently Asked Questions
How do I measure my bra size correctly?
Measure your band size by wrapping a tape around your ribcage under your bust. Measure your bust at the fullest part. The difference determines cup size: 1 inch = A, 2 = B, 3 = C, 4 = D, etc.
What are sister sizes?
Sister sizes are sizes with the same cup volume but different band sizes. When you go down a band size, go up a cup size to maintain volume, and vice versa. For example, 34C = 32D = 36B.
Why do UK and US cup sizes differ after D?
The US uses D, DD (or E), DDD (or F), G, H while the UK uses D, DD, E, F, FF, G, GG. The UK system adds more gradations, especially in larger cup sizes.
How often should I measure my bra size?
Measure every 6-12 months or after significant weight changes, pregnancy, hormonal changes, or starting/stopping exercise. Breast size can fluctuate throughout the month.
Why does my bra size vary between brands?
Different brands use different sizing standards, cup shapes, and band elasticity. Some brands run small or large. European brands often fit differently than American brands.