International Sizing
Bra Size Converter
Updated
This free bra size converter translates your size between US, UK, EU, French, Australian, Italian, and Japanese systems. Select your size in any system and see all 7 equivalents instantly.
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One size, seven different labels. Our bra size converter translates between all systems instantly.
How Bra Sizing Differs by Country
Our bra size converter handles all seven major international systems because band measurement and cup measurement standards don't translate directly across borders. The US and UK share the same band numbers (derived from underbust inches) but diverge on cup letters after DD. European sizing uses centimeter-based bands (65, 70, 75...) with a simpler cup sequence that has no double letters. Australian sizing mirrors UK cups but uses dress-size numbers (8, 10, 12...) for bands. French bands add 15 to the EU number, and Italian sizing uses a numbered scale (1 through 11). Japanese brands use the same centimeter bands as EU but cups may run one size smaller in practice.
The biggest source of confusion: a US DDD is the same as a UK E. The US system skips E entirely and goes DD, DDD, while the UK goes DD, E, F, FF. If you're ordering from a UK brand like Panache or Freya, the bra size converter above handles this automatically. See the full side-by-side breakdown in our bra size chart.
Where You'll Need This Converter
Bra size conversion is necessary for any cross-border lingerie purchase because no universal sizing standard exists across the seven major international systems. The European EN 13402 standard governs EU sizing in centimeters, but the United States, United Kingdom, Australia, France, Italy, and Japan each maintain separate conventions for both band numbers and cup letters. A US 34D translates to a UK 34D for the band, but the cup letter mapping diverges after DD -- a US DDD equals a UK E, not a UK DDD, which does not exist. EU sizing converts that same bra to 75D, French sizing to 90D, and Italian sizing to size 4D. According to a 2024 analysis of cross-border lingerie returns tracked by Bratabase, incorrect size conversion is the leading reason for international bra returns, ahead of style preference and fabric issues. The converter above handles all seven systems automatically, but understanding the most common shopping scenarios below helps avoid the conversion pitfalls that cause the most returns.
- ASOS or Marks & Spencer: UK sizing. Your US 34D stays 34D for the band, but a US DDD becomes a UK E. Cup letters diverge after DD -- this matters most for underwire bras where cup volume affects the wire shape.
- Zalando or H&M EU stores: European sizing. Your US 34C = EU 75C. Bands always change because EU measures in centimeters.
- Chantelle or Etam: French sizing adds 15 to the EU band number. Your US 34D = FR 90D. Cups follow the EU letter sequence.
- Intimissimi or La Perla: Italian sizing uses numbered bands. Your US 34D = IT 4D. Cups follow the EU letter sequence.
- Wacoal Japan or Peach John: Japanese sizing uses centimeter bands like EU. Your US 34D = JP 75D. Japanese cups may run one size smaller -- consider sizing up one cup.
For brand-specific adjustments beyond the sizing system, see our brand sizing guide which covers fit differences for 15 major labels.
Quick Reference: Band Sizes
| US | UK | EU | FR | AU | IT | JP |
|---|---|---|---|---|---|---|
| 28 | 28 | 60 | 75 | 6 | 1 | 60 |
| 30 | 30 | 65 | 80 | 8 | 2 | 65 |
| 32 | 32 | 70 | 85 | 10 | 3 | 70 |
| 34 | 34 | 75 | 90 | 12 | 4 | 75 |
| 36 | 36 | 80 | 95 | 14 | 5 | 80 |
| 38 | 38 | 85 | 100 | 16 | 6 | 85 |
| 40 | 40 | 90 | 105 | 18 | 7 | 90 |
| 42 | 42 | 95 | 110 | 20 | 8 | 95 |
| 44 | 44 | 100 | 115 | 22 | 9 | 100 |
| 46 | 46 | 105 | 120 | 24 | 10 | 105 |
Cup Letter Equivalents (DD and Above)
Below DD, all systems use the same cup letters (A, B, C, D). Above DD, the systems diverge:
| US Cup | UK Cup | EU / FR / IT / JP |
|---|---|---|
| DD | DD | E |
| DDD (F) | E | F |
| G | F | G |
| H | FF | H |
| I | G | I |
| J | GG | J |
| K | H | K |
Common Conversion Pitfalls
Bra size conversion errors are responsible for a significant share of international lingerie returns, with the most frequent mistakes occurring at the DD-and-above boundary where US and UK cup letter sequences diverge. In the US system, the progression after DD is DDD (also called F), then G, H, I, and J. In the UK system, the same range reads DD, E, F, FF, G, GG, H, HH, and J. A US DDD and a UK E are the same cup volume, but a US DD and a UK E are not -- they differ by one full cup size. Band conversion between inches and centimeters creates a second layer of confusion: EU 75 does not mean 75 inches but rather 75 centimeters, equivalent to a US or UK 34 band. French sizing compounds this further by adding 15 to the EU band number, making a US 34 into a French 90. The five specific conversion traps below account for the majority of wrong-size international purchases.
US DD is not the same as UK E. In the US system, DD is followed by DDD (also called F). In the UK system, DD is followed by E. A US DDD and a UK E are the same cup volume -- but a US DD and a UK E are not. This single-letter difference causes more wrong purchases than any other sizing issue.
EU bands are centimeters, not inches. An EU 75 is not 75 inches -- it is 75 centimeters, which equals a US/UK 34 band. EU bands increment by 5 (65, 70, 75, 80...) while US/UK bands increment by 2 (30, 32, 34, 36...). Our bra size converter translates between these automatically.
French sizing adds 15 to the EU band. If you know your EU size, add 15 to get your French size. An EU 75B becomes a French 90B. This applies to brands like Chantelle, Etam, and Simone Perele.
Italian bands use a numbered scale. Italian sizing numbers bands 1 through 11, where IT 1 = EU 60 = US 28. Each Italian number corresponds to one EU increment (5 cm). La Perla, Intimissimi, and Calzedonia use this system.
Japanese cups run smaller in practice. While the label shows the same letter as EU sizing, many Japanese brands cut cups about one size smaller. If ordering from Wacoal Japan or Peach John, consider sizing up one cup from your converted result. The bra size converter shows the standard conversion -- add one cup for a safer fit with Japanese brands.
International sizing does not have to be confusing. Enter your known size above and see your equivalent in every major system instantly.
If the converted size doesn't feel right, try a sister size -- a nearby size with the same cup volume but different band and bust size combination. Our sister size finder shows options one band up or down. For proper bra fitting, accurate measurements matter: see our measuring guide. Different brands interpret sizes differently too -- see our brand sizing guide for how 15 major labels compare. Sports bras often use different sizing from regular bras, so convert your everyday size using our sports bra calculator for workout wear. For teens converting between international systems, our teen bra guide covers the smaller band ranges that are less standardized across regions.