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Bra size calculator

Find your bra size from two measurements, and convert between US, UK and EU sizes.

  • Free
  • No sign-up
  • Works on any device

About Bra size calculator

Measure around your ribcage just under the bust and around the fullest part of the bust. The band size comes from the first number, and the cup letter from the difference between the two. The tool also converts between US, UK and EU sizing, which differ above DD.

How to use Bra size calculator

  1. Type the value you want to convert.
  2. Choose the units to convert from and to.
  3. See the answer instantly, with a table of every unit and the formula.

Why use this tool?

Also known as

Frequently asked questions

How is cup size worked out?

Subtract the band measurement from the bust measurement. Each inch of difference moves up one cup letter, starting at A for 1 inch.

Is Bra size calculator free?

Yes. Bra size calculator on Toolipedia is free to use, with no sign-up and no watermark.

Is it safe to use?

Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.

Does it work on my phone?

Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.

Do I need an account?

No. Just open the page and use the tool. There's no sign-up and no email needed.

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