Bra Size Converter
Match band (30–40 / 65–90) and cup (A–F) labels across US, UK, EU, French and Asian sizing.
Korea/Japan 75 =
- US/UK
- 34
- EU (DE)
- 75
- France/Spain
- 90
- Italy
- 3
- Underbust (cm)
- 73–77
Korea, Japan and the EU label the underbust in centimeters (rounded to 5 cm), the US/UK use inches, France/Spain add 15, and Italy uses a number grade.
Full size conversion chart
Band (underbust)
| Korea/Japan | US/UK | EU (DE) | France/Spain | Italy | Underbust (cm) |
|---|---|---|---|---|---|
| 60 | 28 | 60 | 75 | 0 | 58–62 |
| 65 | 30 | 65 | 80 | 1 | 63–67 |
| 70 | 32 | 70 | 85 | 2 | 68–72 |
| 75 | 34 | 75 | 90 | 3 | 73–77 |
| 80 | 36 | 80 | 95 | 4 | 78–82 |
| 85 | 38 | 85 | 100 | 5 | 83–87 |
| 90 | 40 | 90 | 105 | 6 | 88–92 |
Korea, Japan and the EU label the underbust in centimeters (rounded to 5 cm), the US/UK use inches, France/Spain add 15, and Italy uses a number grade.
Cup
| Korea/Japan | US | UK | EU (DE) | France/Spain | Bust − underbust (cm, KR/JP/EU basis) |
|---|---|---|---|---|---|
| AA | AA | AA | AA | AA | 7.5 |
| A | A | A | A | A | 10 |
| B | B | B | B | B | 12.5 |
| C | C | C | C | C | 15 |
| D | D | D | D | D | 17.5 |
| E | DD | DD | E | E | 20 |
| F | DDD (F) | E | F | F | 22.5 |
| G | G | F | G | G | 25 |
Labels match up to D, then diverge (US DD = EU E). The centimeter column follows the KR/JP/EU convention (2.5 cm per cup); US brands measure the band differently, so the same letter often holds more volume. Always confirm with measurements.
How to use
- Pick the country or sizing system you already know — e.g. "US" if the garment was bought in US sizing.
- Select your size and the equivalents in every other system appear at once.
- Check the full chart below too — knowing the neighboring sizes helps when you're between sizes.
Frequently asked questions
Why do sizes differ so much between countries?+
Each country grades sizes differently: Korea and Japan label actual measurements (mm/cm), the US and UK use inches and their own grades, and Europe uses separate number systems. They're different names for the same body, so a chart can line them up.
What is a US 34C in European sizing?+
Band 34 corresponds to EU 75, so US 34C ≈ EU 75C. In French/Spanish sizing that's a 90C; in Italy, band grade 3.
What is a US DD cup elsewhere?+
Cup letters match up to D, then diverge: US DD = UK DD = EU/Japan/Korea E, and US DDD (F) = UK E = EU F.
What are sister sizes?+
Cup volume scales with the band: if a 34C band feels loose, a 32D holds the same volume; if tight, try 36B. Move the cup one step opposite for every band step.
What if a brand's sizing doesn't match the chart?+
This chart follows the standard international correspondence, but cuts vary by brand — expect up to one size of drift. The safest check is the brand's own size chart with actual measurements in centimeters.
Is it really free?+
Yes. No sign-up, no install, no usage limits. The site is ad-supported.
Unit guide
How band and cup are defined
A bra size is two measurements. The band is your underbust circumference; the cup is the difference between bust and underbust — about 10 cm (4 in) is an A, and each additional 2.5 cm (1 in) adds a cup letter.
Korea, Japan and the EU label the band in centimeters (65·70·75), the US and UK in inches (30·32·34). France/Spain add 15 to the EU number and Italy uses grades 1·2·3 — different labels for the same body.
How to measure accurately
Measure the underbust right below the breasts, tape level, after exhaling. Measure the bust across the fullest point, keeping the tape level. Wear a thin, non-padded bra or none.
Example: underbust 73 cm and bust 88 cm → band 75 (US 34), difference 15 cm → C cup: a 75C / 34C. With those two numbers the converter above finds your size in any system.