UK vs US vs EU Bra Sizes: What’s the Difference?
If you’ve ever bought bras online or from international brands, you’ve probably noticed that the same body can have different size labels depending on the country. This guide explains how UK, US, and EU bra sizes differ, shows conversion examples, and tells you how to shop safely across systems.
To get your size with automatic conversions, use the UK Bra Size Calculator
The short version
- UK, US, and EU use different sizing systems
- The band numbers and cup letters don’t progress the same way
- A size like 34F (UK) does not equal 34F (US) or 75F (EU)
- You should always convert sizes before buying internationally
- The calculator does this for you automatically
The three systems at a glance
1) UK sizing (the system your site uses)
- Band sizes: 28, 30, 32, 34, 36, 38, 40, 42, …
- Cup progression: A, B, C, D, DD, E, F, FF, G, GG, H, HH, …
- Cup letters double up after D (DD, FF, GG, HH, etc.)
- Very common in the UK and used by many UK brands
Learn how it works: How UK Bra Sizes Work (Band + Cup)
2) US sizing
- Band sizes often look similar to UK (32, 34, 36, etc.)
- Cup progression is different:
- A, B, C, D, DD or DDD, G, H, I, etc. (varies by brand)
- The US system does not use the same double-letter pattern as the UK
- This means a US F is not the same as a UK F
Result:
You cannot safely guess your US size from your UK size without converting.
3) EU sizing
- Band sizes are shown in centimetres, like: 65, 70, 75, 80, 85, 90, …
- These roughly correspond to:
- UK 30 ≈ EU 65
- UK 32 ≈ EU 70
- UK 34 ≈ EU 75
- UK 36 ≈ EU 80
- Cup letters also follow a different progression from the UK
- Many EU brands use single letters more consistently
So a UK 34D might be labelled EU 75D, but the cup progression beyond D can differ by brand.
Why the same bra fits but the label changes
Because:
- The band number scale is different (inches vs centimetres)
- The cup letter steps are different
- Some systems use double letters, others don’t
- Brands interpret sizing slightly differently
That’s why:
The fit can be similar, but the label is not the same.
UK to US to EU conversion (common examples)
Important: These are approximate conversions. Always check the brand’s own size guide.
| UK Size | US Size (approx) | EU Size (approx) |
|---|---|---|
| 30D | 30D | 65D |
| 32C | 32C | 70C |
| 34D | 34D | 75D |
| 34DD | 34DD or 34E | 75E |
| 34E | 34DDD or 34F | 75F |
| 34F | 34G | 75G |
| 36F | 36G | 80G |
| 38G | 38I | 85I |
Notice how cup letters shift differently between systems.
For automatic, brand-agnostic conversion, use: UK Bra Size Calculator
The biggest source of confusion: Cup letters
In the UK system, cups go:
D → DD → E → F → FF → G → GG → H → HH → …
In the US system, many brands go:
D → DD or DDD → G → H → I → …
So:
- A UK F is not a US F
- A UK FF doesn’t even exist in many US systems as “FF”
- That’s why direct letter-to-letter comparison fails
How to shop internationally (the safe method)
- Start with your UK size
- Use a conversion tool or chart (or our calculator)
- Check the brand’s own size guide if available
- Order your converted size (and consider a sister size)
- Check fit when it arrives and adjust if needed
Helpful tools:
What conversions can’t guarantee
Even with correct conversion:
- Brands fit differently
- Styles fit differently (plunge vs full-cup, etc.)
- Fabrics stretch differently
- Comfort preferences vary
So conversion gives you:
A strong starting point, not a perfect promise.
Read more:
If the converted size feels wrong
Try:
- A sister size (same cup volume, different band)
- A different style
- Re-checking your measurements
Start here:
Quick summary
- UK, US, and EU bra sizes use different systems
- Band numbers and cup letters don’t match directly
- A UK F is not a US F
- Conversions are approximate, not perfect
- Use tools and brand guides to reduce mistakes
- Always judge by fit, not just the label
Want the easy way?
Use the UK Bra Size Calculator It gives you:
- Your UK starting size
- Sister sizes
- International conversions in one place