How to use the bra size converter
- In Size system I know, choose the system on your current label: US, UK, EU (DE, NL, SE…), France / Belgium / Spain, Italy, or Australia / New Zealand.
- Enter the Band number. The help text shows the usual range for each system, for example 60–105 for EU and 0–10 for Italy.
- Type the Cup letter, such as C, DD or FF.
- Read the six equivalent sizes. Scroll down for the band chart and the cup-letter chart.
What it does and when to use it
Bra labels use different numbers for the band and different letter sequences for the cup. That makes ordering from a shop in another country, or reading a European label in a US store, confusing. The tool takes a size in one system and lists the conventional equivalent in the other five.
Because body shapes and brand cuts vary, treat the answer as the size to try first, not a guaranteed fit. For other garments, the clothing size converter uses the same “brands vary” approach, and the ring size converter and shoe size converter cover jewellery and footwear.
How it works
The tool converts your band to a US band in inches, rounds it to the nearest even size, and then applies these conventional formulas:
| System | Band from US band |
|---|---|
| UK | same as US |
| EU (DE, NL, SE…) | 80 + 2.5 × (US − 36) |
| FR / BE / ES | EU + 15 |
| IT | (US − 28) ÷ 2 |
| AU / NZ | US − 20 |
The cup is converted by its step position. Step 1 is AA, step 4 is C, and so on. The step then takes the letter that the other system uses for that position. The US list runs to K, the UK and Australian list to H (with DD, FF and GG), and the EU, French and Italian list to K, with no double letters.
Worked examples
US 34C. The tool gives UK 34C, EU 75C, FR / BE / ES: 90C, IT 3C and AU / NZ 14C.
UK 32E. This is one step beyond DD, so the tool gives US: 32DDD (F), EU 70F and AU / NZ 12E.
An odd band. Entering US 33B gives Band 33 sits between US sizes, so it was rounded up to 34, as fitters usually do. with a suggestion to try 32 as well. The results are then for 34B, such as EU 75B.
Limits and tips
- Conventions, not a standard. These charts are common conversions, and brand charts can differ by a band or a cup.
- Very large cups beyond UK H or US/EU K are not in the charts. A letter outside the list gives a message showing the accepted letters.
- Measure in both units if you are unsure. The length converter turns centimetres into inches for brand charts that use the other unit.
Frequently asked questions
Is there an official international bra size standard?
Why do UK and US sizes stop matching after D?
Can I type E or F for a US cup?
What are sister sizes?
Why does the tool round my band size?
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