If you shop across different brands or countries, you will quickly discover that bra size conversion is not always intuitive. A size that looks familiar in one market can be labeled very differently in another.
This guide explains the basics. For instant conversions, use our Bra Size Conversion Tool.
Why Bra Size Conversion Matters
US, UK, and EU sizing systems do not label band sizes and cup progressions the same way. That means you should not assume your exact label will transfer directly from one system to another.
Band Size Conversion Basics
Band sizes are expressed differently by region. For example:
- US/UK 32 often maps to EU 70
- US/UK 34 often maps to EU 75
- US/UK 36 often maps to EU 80
Cup Conversion Is Not Always One-to-One
Cup labeling differs more than many shoppers expect. A DD in one system may line up with E in another, and some brands skip or combine certain cup steps. That is why automated conversion is safer than guessing.
When to Use a Conversion Tool
- Shopping from an international lingerie brand
- Comparing your size across US, UK, and EU labels
- Reading fit reviews from another region
- Trying a new brand that uses a different size system
Why Converted Sizes Still Need a Fit Check
Even when the conversion is technically correct, brand shape and fabric can still change the fit. That is why it helps to compare the result with your usual fit issues and, if needed, test sister sizes.
Frequently Asked Questions
Is UK bra sizing the same as US sizing?
Not exactly. Band numbers are often similar, but cup progression can differ, especially in higher cup sizes.
Can I convert bra size by memory?
It is better to use a chart or calculator because cup labels vary more than most shoppers expect.
What should I do after converting my size?
Use the converted size as a baseline, then judge by fit. If needed, test a sister size or compare styles with different cup shapes.