Bra Size Chart – US, UK & EU Explained
Why the same letter means something different in every country – and how to find your size anywhere in the world.
Have you ever bought a bra from a UK brand and wondered why the size didn't match your usual US size? Or tried to order from a European store and felt completely lost with the numbers?
You're not alone. Bra sizing is not the same everywhere. The same cup letter can mean something completely different depending on where you're shopping. A US D cup is the same as a UK D cup – but a US DDD is a UK E, and a US G is a UK F. Confusing, right?
This guide will help you understand the differences between US, UK, EU, AU, and FR sizing systems. By the end, you'll be able to convert your size with confidence and shop from any brand in the world.
💡 Need to convert your size right now? Use our Bra Size Conversion Tool – enter your size and get equivalents in every system.
Why Bra Sizes Differ Around the World
Different countries use different sizing conventions. The band number might be the same, but the cup letters can change dramatically from one system to another.
Here's the simple breakdown:
- US sizing – uses bands in inches (32, 34, 36...) and cup letters A, B, C, D, DD, DDD, G, H, I, J...
- UK sizing – uses the same bands as US but different cup letters from DD upward: DD, E, F, FF, G, GG, H, HH, J...
- EU sizing – uses bands in centimeters (70, 75, 80...) and cups A, B, C, D, E, F, G, H, I, J...
- AU / NZ sizing – follows UK cup letters but band numbers are different (e.g., US 34 = AU 12)
- FR / ES sizing – uses EU bands + 15 (e.g., EU 75 = FR 90) with similar cup letters to EU
The good news? US and UK band numbers are the same. A 34 is a 34 in both systems. The difference is in the cup letters from DD upward.
Use our Bra Size Calculator to get your US and UK size instantly.
Band Size Conversion Chart
Band sizes are measured differently depending on where you live. US and UK use inches, while EU, AU, and FR use centimeters.
| Underbust (in) | Underbust (cm) | US / UK | EU | AU / NZ | FR / ES |
|---|---|---|---|---|---|
| 26.5 – 28.5 | 67 – 72 | 28 | 60 | 6 | 75 |
| 28.5 – 30.5 | 72 – 77 | 30 | 65 | 8 | 80 |
| 30.5 – 32.5 | 77 – 82 | 32 | 70 | 10 | 85 |
| 32.5 – 34.5 | 82 – 87 | 34 | 75 | 12 | 90 |
| 34.5 – 36.5 | 87 – 92 | 36 | 80 | 14 | 95 |
| 36.5 – 38.5 | 92 – 97 | 38 | 85 | 16 | 100 |
| 38.5 – 40.5 | 97 – 102 | 40 | 90 | 18 | 105 |
| 40.5 – 42.5 | 102 – 107 | 42 | 95 | 20 | 110 |
| 42.5 – 44.5 | 107 – 112 | 44 | 100 | 22 | 115 |
| 44.5 – 46.5 | 112 – 117 | 46 | 105 | 24 | 120 |
* EU bands are measured in centimeters. FR bands are typically EU band + 15.
Cup Size Conversion Chart
This is where things get tricky. From DD upward, US and UK cup letters diverge significantly.
| Diff (in) | US | UK | EU | AU / NZ | FR |
|---|---|---|---|---|---|
| 0 – ½ | AA | AA | AA | AA | AA |
| 1 | A | A | A | A | A |
| 2 | B | B | B | B | B |
| 3 | C | C | C | C | C |
| 4 | D | D | D | D | D |
| 5 | DD / E | DD | E | DD | E |
| 6 | DDD / F | E | F | E | F |
| 7 | G | F | G | F | G |
| 8 | H | FF | H | FF | H |
| 9 | I | G | I | G | I |
| 10 | J | GG | J | GG | J |
* US and UK cups match up to D. From DD upward, they diverge significantly.
Need to convert your size right now? Use our Bra Size Conversion Tool for instant results.
Quick Reference – Common Conversions
Here are some of the most common conversions you'll encounter when shopping internationally.
| US | UK | EU | AU / NZ | FR |
|---|---|---|---|---|
| 30A | 30A | 65A | 8A | 80A |
| 30B | 30B | 65B | 8B | 80B |
| 32A | 32A | 70A | 10A | 85A |
| 32B | 32B | 70B | 10B | 85B |
| 32C | 32C | 70C | 10C | 85C |
| 34A | 34A | 75A | 12A | 90A |
| 34B | 34B | 75B | 12B | 90B |
| 34C | 34C | 75C | 12C | 90C |
| 34D | 34D | 75D | 12D | 90D |
| 34DD | 34DD | 75E | 12DD | 90E |
| 34DDD | 34E | 75F | 12E | 90F |
| 34G | 34F | 75G | 12F | 90G |
| 36A | 36A | 80A | 14A | 95A |
| 36B | 36B | 80B | 14B | 95B |
| 36C | 36C | 80C | 14C | 95C |
| 36D | 36D | 80D | 14D | 95D |
| 36DD | 36DD | 80E | 14DD | 95E |
| 36DDD | 36E | 80F | 14E | 95F |
| 36G | 36F | 80G | 14F | 95G |
* Quick reference only. Use our conversion tool for complete conversions.
Tips for Shopping Internationally
When you're shopping from a brand in another country, here are some tips to get the right size:
- Know which sizing system the brand uses – check their size guide before buying.
- Use a conversion tool – enter your size and get equivalents instantly.
- Read reviews – many reviewers will say if a brand runs small or large.
- Order multiple sizes – if you're unsure, order 2-3 sizes and return the ones that don't fit.
- Check sister sizes – if your size feels off, try a sister size in that brand.
Use our Brand Size Converter to map your size to specific brands like Victoria's Secret, Wacoal, ThirdLove, and Skims.
Frequently Asked Questions
What is the difference between US and UK bra sizes?
US and UK bands use the same inch numbers (e.g., 34 is 34 in both). However, cup letters differ from DD upward. US DDD = UK E, US G = UK F, US H = UK FF.
How do I convert EU band size to US?
EU bands are measured in centimeters. Subtract 4 from the US band and multiply by 2.54 to get the EU band. For example, US 34 → (34-4) × 2.54 = 76 cm → EU 75.
What are sister sizes?
Sister sizes have the same cup volume but different band and cup letter combinations. If you go down one band size, go up one cup size. If you go up one band size, go down one cup size. For example, 34C → 32D (tighter band) or 36B (looser band).
How is cup size calculated?
Cup size is the difference between your bust measurement and your band measurement. Each inch of difference equals one cup letter: 1" = A, 2" = B, 3" = C, 4" = D, 5" = DD, 6" = DDD, 7" = G, and so on.
Why is my size different in different brands?
Different brands use different fit models, fabric, and construction. Your size may vary by brand – that's why sister sizing and trying on multiple sizes is recommended.
Does IMRango store my measurements?
No. Everything runs locally in your browser. We do not collect, store, or share any of your personal data or measurements.
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