If you’ve traveled abroad and probably shopped bras, you might have noticed that bra sizes don’t always match up between your home country and where you traveled to. One size that fits perfectly in the United States may be totally differently in the United Kingdom. For some women this can be frustrating especially when you try to order online or buy from UK-based brands like Panache, Freya, or Curvy Kate.
Well, we have some good news for you. Converting your bra sizes between US and UK systems is not as hard as you think. In this guide, I will give you a US-to-UK bra size conversion chart, simple rules for converting, and tips for getting the right fit no matter where you shop.
I also have a bra calculator tool that I developed where you only need to input your measurements and it will give you the correct size of your bra in either US or UK
Why US and UK Bra Sizes Differ
While both the US and UK use inches to measure bra sizes, the main issue is how the cup sizes are labeled.
- In the United States, cup sizes typically go: A, B, C, D, DD, DDD/F, G, H…
- In the UK system, the cups extend further with additional double letters: A, B, C, D, DD, E, F, FF, G, GG, H, HH…
👉 Bands remain the same across both systems. A US 34 band is still a 34 in the UK. The issue boils down to matching cups correctly.
US to UK Bra Size Conversion Chart
Here’s my reference chart to help you find your size when converting between the US and UK sizing systems:
| US Size | UK Size |
|---|---|
| 30A | 30A |
| 30B | 30B |
| 30C | 30C |
| 30D | 30D |
| 30DD/E | 30DD |
| 30DDD/F | 30E |
| 30G | 30F |
| 32A | 32A |
| 32B | 32B |
| 32C | 32C |
| 32D | 32D |
| 32DD/E | 32DD |
| 32DDD/F | 32E |
| 32G | 32F |
| 34A | 34A |
| 34B | 34B |
| 34C | 34C |
| 34D | 34D |
| 34DD/E | 34DD |
| 34DDD/F | 34E |
| 34G | 34F |
| 36A | 36A |
| 36B | 36B |
| 36C | 36C |
| 36D | 36D |
| 36DD/E | 36DD |
| 36DDD/F | 36E |
| 36G | 36F |
| 38A | 38A |
| 38B | 38B |
| 38C | 38C |
| 38D | 38D |
| 38DD/E | 38DD |
| 38DDD/F | 38E |
| 38G | 38F |
| 40A | 40A |
| 40B | 40B |
| 40C | 40C |
| 40D | 40D |
| 40DD/E | 40DD |
| 40DDD/F | 40E |
| 40G | 40F |
📌 Tip: After a US DD, the lettering starts to diverge. For example, a US DDD = UK E, and a US G = UK F.
How to Convert US to UK Bra Sizes (Step-by-Step)
- Keep the band number the same. A US 34 is still a 34 in the UK.
- Adjust the cup size after D.
- US DD = UK DD
- US DDD/F = UK E
- US G = UK F
- Check the brand’s size guide. Some brands may have slight variations in sizing.
US to UK Bra Size Conversion – Common Mistakes
- Thinking that US DDD = UK DD (in fact, it equals UK E).
- Ignoring the fact that UK has extra double-letter cups (FF, GG, HH).
- Assuming sizes are universal across all brands—always double-check.
Expert Tips
- Measure before converting. Use a tape measure to check your underbust (band) and bust (cup) size.
- Try sister sizes. For example, if a 34C US is too tight, try a 36B US (which is a 36B UK as well).
- Know your brand. Some brands fit larger or smaller, so consider trying on if possible.
US to UK Bra Size Conversion FAQs
Do US and UK bra sizes use the same bands? Yes, band numbers (30, 32, 34, etc.) are the same in both systems.
Is a US DDD the same as a UK E? Yes, US DDD (sometimes called F) equals UK E.
Why does the UK use extra cup sizes like FF or GG? The UK system is more detailed, allowing for more precise cup fits beyond a standard D.
How do I know if I need a UK FF or GG cup? If you wear a US G or H, you’ll likely fall into the UK FF or GG range.
Conclusion: Find Your Perfect Size
Shopping for bras internationally doesn’t need to be stressful. By remembering that bands stay the same and cups shift after D, you can easily convert your US size to a UK size. Use the chart above as your go-to guide, and you’ll be confident when ordering from UK brands.
