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Bra Size Converter

Convert a bra size across US, UK, EU, FR and AU/NZ in one click.

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How to use

  1. 1.Measure your band by wrapping a tape snugly around your ribcage just under your bust, keeping it level, then round to the nearest inch or centimetre.
  2. 2.Measure your cup by taking a loose measurement around the fullest part of your bust; the difference from the band size sets the cup letter (about one inch per cup).
  3. 3.Choose the system you already know (US, UK, EU, FR or AU/NZ), select that band and cup, and read the equivalent size in every other system in the results table.

About Bra Size Converter

The Bra Size Converter turns a single bra size into its equivalent across the world's main sizing systems: US/Canada, UK, EU (German, in centimetres), FR (French/Spanish, in centimetres) and AU/NZ. Pick the system you already know, choose your band and cup, and the converter instantly shows the matching size everywhere else. Everything runs in your browser, so nothing you type is uploaded or stored anywhere.

Bra sizing is confusing because two things change at once. The band changes units: US and UK bands are measured in inches (28 to 44), while EU and French bands are in centimetres, and French band numbers run 15 higher than the EU number (EU 75 is FR 90). AU/NZ uses its own short numbers (a US 34 band is an AU/NZ 12). The cup letters change too. US and UK share the same letters up to and including DD, then they diverge: a US DDD is a UK E, and a US G is a UK F (the US skips a standalone F, so DDD is the F-equivalent). European cups avoid double letters entirely and simply keep counting up A, B, C, D, E, F, G, so a US DD becomes an EU E and a US DDD becomes an EU F. This converter builds every result from one cross-checked reference ladder, so the divergence above DD is handled correctly instead of guessed.

To measure yourself, you need two numbers. For the band, wrap a tape measure snugly around your ribcage directly under your bust, keeping it level and parallel to the floor, and round to the nearest inch or centimetre. For the cup, measure loosely around the fullest part of your bust. The difference between the bust measurement and the band measurement gives the cup: roughly one inch of difference per cup, so a one-inch difference is about an A, two inches a B, three a C, four a D, five a DD, and so on. Once you have a starting size in any one system, drop it into the converter to read it in all the others.

A quick example: enter US 34C and you will see UK 34C, EU 75C, FR 90C and AU/NZ 12C. Enter US 34DDD and the tool shows UK 34E and EU 75F, exactly where the systems split. You can also work backwards, starting from an EU 80E label on an imported bra to find the US, UK and AU/NZ equivalents.

One honest caveat: bra sizes are never perfectly standardised. Real fit varies noticeably between brands, styles, fabrics and wired versus wireless construction, and vanity sizing is common. Treat the result as a well-researched starting point rather than a guarantee. Whenever you can, try the size on or check the specific brand's own size chart before buying, especially for the extended cup range where naming conventions differ most. Use this converter to translate between systems quickly, then let real-world fit make the final call.

Frequently asked questions

How do I measure my bra size at home?
Take two measurements with a soft tape. For the band, wrap it snugly around your ribcage directly under your bust and keep it level; round to the nearest inch or centimetre. For the cup, measure loosely around the fullest part of your bust. Subtract the band from the bust measurement: roughly one inch of difference equals one cup size (1 inch = A, 2 = B, 3 = C, 4 = D, 5 = DD, and so on).
Why do US and UK cup letters differ above DD?
US and UK sizing match through D and DD, then they split. The UK continues DD, E, F, FF, G, GG, while the US uses DD, DDD, G, H, I. So a US DDD is a UK E, and a US G is a UK F. European sizes avoid double letters and just keep counting (a US DD is an EU E). This converter uses one cross-checked ladder so those divergent points line up correctly.
Is the converted size guaranteed to fit?
No. Bra sizing is not strictly standardised, so fit varies noticeably between brands, styles, fabrics, and wired versus wireless designs, and vanity sizing is common. Use the converted size as a well-researched starting point, then try the bra on or check the specific brand's own size chart before buying, especially in the extended cup range.

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