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Disclaimer

Last updated: 17 October 2026

1. General information only

Everything on brasize.xyz is general information written for a broad audience. It doesn't take your personal circumstances into account. Use it as a starting point for your own decisions, alongside a brand's size chart and, where you can, a proper fitting.

2. Results are estimates

Our calculators apply standard band-and-cup formulas to the measurements you enter. The result depends entirely on those numbers, so a tape that slips, a padded bra worn while measuring, or a typing mistake will change it. Even with perfect measurements, two numbers can't describe:

• breast shape, projection, root width or how full the top and bottom are;
• tissue firmness, or differences between the left and right side;
• how a particular brand cuts its cups, wires and bands.

Treat a calculated size as the size to try first, and use the fit check and sister sizes to fine-tune from there.

3. Brand and country differences

There is no single international bra size standard. Labels change between countries (a US 34DDD is a UK 34E, a European 75F and a French 90F), and brands within the same country size differently too. Our conversions follow the most widely used conventions, but:

• US brands are inconsistent above DD, and some use E or F for different steps;
• centimetre systems step their cups in 2 cm rather than 1 inch, so larger European cup conversions are approximate;
• Japanese (JIS) sizing uses its own centimetre scale, so its conversions are approximate too.

When a brand publishes its own size chart, that chart takes priority over ours.

4. Volume, shape and body tools

Some tools estimate things like cup volume, breast weight, projection, symmetry, lift or tissue firmness. These use simplified models and averages to help you choose bra styles. They are rough guides, not measurements, and they can't be used to assess health, compare against medical norms, or plan any treatment or procedure.

5. Pregnancy, teens and life stages

Size changes during puberty, pregnancy, breastfeeding, after birth and with weight change vary a lot from person to person. Our life-stage calculators show typical patterns to help with shopping, not predictions for any individual. Parents choosing a first bra for a child should use these tools as a general guide alongside a fitting.

6. Not health guidance

Bra Size covers clothing fit only. Please see a doctor or other qualified health professional if you notice:

• a new lump, thickening or change in skin or nipple;
• pain that doesn't settle, or discomfort that isn't explained by a poorly fitting bra;
• sudden or unexplained changes in size or shape, or noticeable new asymmetry.

Nothing on this site should delay or replace medical advice.

7. External and paid links

We link to other websites when we think they're useful. We don't control those sites and aren't responsible for their content, products, prices or privacy practices. Some links may be affiliate or sponsored links; our Affiliate Disclosure explains how we handle them. Paid relationships never change our calculators or their results.

8. No warranty and liability

We work to keep our formulas, charts and articles accurate and up to date, and we correct errors when we find them. Even so, the site is provided "as is", without any guarantee that it is complete, error-free or suitable for a particular purpose. To the extent the law allows, Bra Size is not responsible for purchases, returns, discomfort or any other outcome connected with relying on the site. Using the site also means accepting our Terms & Conditions.

9. Changes and contact

We may update this disclaimer as the site changes; the date at the top shows the latest version. If you spot a mistake or have a question, email hello@brasize.xyz or visit our contact page.