UK to US bra size converter
Pick the band and cup from a UK label to see the matching US size.
Loading the tool…
Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter uk band and uk cup.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Band: US and UK 32 = EU 70 = FR 85 = IT 1 = AU 10, and each step adds 2 in (US, UK), 5 cm (EU, FR), 1 (IT) or 2 (AU). Cup: letters are matched by position. UK: AA A B C D DD E F FF G, US: AA A B C D DD DDD G H I, EU, FR and IT: AA A B C D E F G H I.
Example
Inputs: UK band = 34, UK cup = DD. Result: US size: 34DD; EU size: 75E; French size: 90E.
Limits and caveats
- Follows the usual retail chart; some brands differ by one cup size.
- Some US brands label DDD as F, and Australian cup letters past F are not consistent, so they are not shown.
Questions about this tool
Does the band number change from UK to US?
No. Both systems measure the band in inches, so 34 stays 34. Only the cup letters differ.
What is a UK E cup in US sizes?
It is DDD on most US charts, and some brands call it F.
Why do the sizes split after DD?
UK sizing uses doubled letters such as FF and GG, while US sizing goes from DDD to G and then H.