SIZE GUIDES / Underwear
Bra Size Conversion Chart — UK, US, EU & France
Convert complete bra labels with ASOS US, UK, Europe and France tables, plus selected Triumph Japan and South Korea references.
Updated: · No sign-up required
Find a country or size system
Choose a country to jump to its size chart. Use the chart for the brand you plan to buy; unavailable systems cannot be converted here.
Japan and Korea are available in the separate Triumph table. Russia and S-M-L are not derived from the ASOS cup rows; these references also do not calculate a cup from bust alone.
Band and cup conversion
Choose a size to highlight matches, or select a row below.
Scroll sideways for the full chart
| UK | US | Europe (EU) | FR |
|---|---|---|---|
| 30A | 65A | 80A | |
| 30B | 65B | 80B | |
| 30C | 65C | 80C | |
| 30D | 65D | 80D | |
| 30DD/E | 65E | 80E | |
| 30DDD/F | 65F | 80F | |
| 30G | 65G | 80G | |
| 30H | 65H | 80H | |
| 30I | 65J | 80J | |
| 32B | 70B | 85B | |
| 32C | 70C | 85C | |
| 32D | 70D | 85D | |
| 32DD/E | 70E | 85E | |
| 32DDD/F | 70F | 85F | |
| 32G | 70G | 85G | |
| 32H | 70H | 85H | |
| 32I | 70J | 85J | |
| 34A | 75A | 90A | |
| 34B | 75B | 90B | |
| 34C | 75C | 90C | |
| 34D | 75D | 90D | |
| 34DD/E | 75E | 90E | |
| 34DDD/F | 75F | 90F | |
| 34G | 75G | 90G | |
| 34H | 75H | 90H | |
| 34I | 75J | 90J | |
| 36A | 80A | 95A | |
| 36B | 80B | 95B | |
| 36C | 80C | 95C | |
| 36D | 80D | 95D | |
| 36DD/E | 80E | 95E | |
| 36DDD/F | 80F | 95F | |
| 36G | 80G | 95G | |
| 36H | 80H | 95H | |
| 36I | 80J | 95J | |
| 38A | 85A | 100A | |
| 38B | 85B | 100B | |
| 38C | 85C | 100C | |
| 38D | 85D | 100D | |
| 38DD/E | 85E | 100E | |
| 38DDD/F | 85F | 100F | |
| 38G | 85G | 100G | |
| 38H | 85H | 100H | |
| 38I | 85J | 100J |
Convert an existing ASOS bra size here. UK 32A is unavailable; check ASOS directly for that size. To find your first bra size, use the brand’s fitting guide.
Brand size guide: ASOS · own-brand reference
Triumph bras: Japan & South Korea
Choose a size to highlight matches, or select a row below.
Scroll sideways for the full chart
| US | UK | Europe (EU) | Japan | Korea |
|---|---|---|---|---|
| 32A | 70A | 70B | 70B | |
| 34A | 75A | 75B | 75B | |
| 36A | 80A | 80B | 80B | |
| 32B | 70B | 70B/C | 70B/C | |
| 34B | 75B | 75B/C | 75B/C | |
| 36B | 80B | 80B/C | 80B/C | |
| 38B | 85B | 85B/C | 85B/C | |
| 40B | 90B | 90B/C | 90B/C | |
| 32C | 70C | 70C | 70C | |
| 34C | 75C | 75C | 75C | |
| 36C | 80C | 80C | 80C | |
| 38C | 85C | 85C | 85C | |
| 40C | 90C | 90C | 90C |
For selected Triumph A–C cup sizes. Japan and South Korea use the same labels in this chart; B/C is a combined label. Use ASOS separately. Russia and S-M-L are unavailable.
Brand size guide: Triumph · international size guide
Convert the full band-and-cup label, not the cup alone
A 34DD label contains a band and a cup sequence. The ASOS reference maps UK 34DD to US 34DD/E and Europe 75E. The separate Triumph Asia reference contains selected A–C rows and preserves its Japan/South Korea labels, including B/C entries. Choose the table matching your brand before converting.
Do not use a T-shirt S-M-L scale to replace a wired bra label. Bralettes and sports bras may use letters, but they need their own model chart. If the band rides up, the cups gap or tissue spills over, revisit the brand’s fitting method rather than assuming a different country label will change the underlying fit.
See how a size converts
In Band and cup conversion choose UK 34E. The listed equivalents are:
- UK 34E
- US 34DDD/F
- Europe (EU) 75F
- FR 90F
Brand size guide: ASOS · own-brand reference
Open this example in the converter →Three checks before ordering
- Match the product brand, country system and garment type to the selected table.
- Keep body and garment measurements separate, with consistent centimetre or inch units.
- Check the specific style’s length, width and stretch, then read the store’s sizing and exchange information.
START WITH MEASUREMENTS
How to measure
- 01
Read the complete label on a well-fitting bra, including the country system.
- 02
If measuring, record underbust and fullest bust separately for the brand’s own fitting guide.
- 03
Check band comfort, cup containment and straps when trying the new size.
A few things labels don’t tell you.
A cup letter has meaning only with its band. Do not substitute E for DD across every brand, or treat sister sizes as identical labels.
Common questions
What is UK 34DD in this chart?
US 34DD/E, EU 75E and FR 90E in the ASOS reference.
Can this calculate my cup from a bust measurement?
No. This tool converts existing labels; use a brand-specific fitting method to establish a starting size.
Can I convert bra sizes to Russia, Japan, Korea or S-M-L?
Japan and Korea are available in the separate Triumph table. Russia and S-M-L are not derived from the ASOS cup rows; these references also do not calculate a cup from bust alone.