Bra Size Converter
Convert bra sizes between US, UK, EU, and International band and cup sizing conventions.
Converted Sizes
US
34B
UK
34B
EU
75C
International
75C
How to Use the Bra Size Converter
Select your region (US, UK, EU, or International), then choose your band size and cup letter. The converter shows the equivalent size across all four regions at once, using standard band-size and cup-letter conversion conventions.
How Band and Cup Conversions Work
Band size converts using a standard offset formula: European and International band sizes are measured in centimeters, so a US/UK band size (measured in inches) of 34 becomes roughly 75 in EU/International sizing. Cup letters shift between regions too — a US cup letter typically corresponds to the same UK letter for most sizes, but shifts one letter higher in EU/ International sizing (for example, a US B cup is roughly a EU C cup).
Example
A US 34B converts to approximately a UK 34B, and a EU/International 75C.
Common Use Cases
- Shopping from an international lingerie retailer that lists sizes in a different region's system.
- Understanding how your usual size translates while traveling or ordering from abroad.
- Comparing sizing conventions between US/UK and Continental European brands.
FAQs
Are bra size conversions exact across brands?
No — bra sizing conventions vary meaningfully between manufacturers and even between styles from the same brand, since there's no single global sizing standard enforced across the industry. This converter applies widely used standard conversion rules as a reliable starting point, but the best way to confirm fit is always to try the garment on or check the specific brand's own size chart.
Why do band sizes look so different between US and EU?
US and UK band sizes are based on an inch measurement (with an offset), while EU and International band sizes are based directly on the underbust measurement in centimeters, which is why the numbers look very different (like 34 vs. 75) even though they describe the same fit.
Why does the cup letter change between regions for the same fit?
Different regions historically developed their own cup-lettering conventions, so the same physical cup volume can carry a different letter depending on the sizing system — EU/International sizing generally runs one cup letter higher than the equivalent US letter.