Terms of use

Last updated 5 September 2026.

By using this site you accept the terms below. They are short because the site is simple: it is a free calculator that sells nothing and collects nothing.

What the calculators are, and are not

Everything on this site is an estimate produced by arithmetic from the measurements you supply. A bra size calculated here is a well-reasoned starting point for finding a size that fits - it is not a guarantee that any particular garment will fit you.

Two limits are worth stating plainly, because they are inherent rather than incidental. First, bra sizing is not standardised between brands or even between styles within a brand, so a size that fits perfectly in one cut may not in another. Second, the breast weight estimate is the output of a model and is given as a range rather than a single figure, because published measurements of average breast volume differ roughly twofold between populations. It is not a measurement of your body.

Not medical advice

Nothing here is medical advice. If you have pain, skin changes, lumps, marked new asymmetry, or any other concern about your breasts, that is a matter for a doctor and not for a sizing tool. Do not use anything on this site to diagnose, treat or rule out a condition, and do not delay seeking care because of something you read here.

Accuracy

The conversion tables were checked against multiple independent sources and the arithmetic is covered by automated tests, but no warranty is given that the site is free of error. If you find one - particularly in a conversion - please report it via the contact page; corrections are made promptly and are the most useful thing anyone sends us.

Liability

The site is provided "as is", without warranties of any kind. To the fullest extent permitted by law, we are not liable for any loss arising from your use of it, including any purchase made on the basis of a calculated size. Nothing in these terms limits liability that cannot lawfully be limited.

Acceptable use

You may use this site freely for personal reference. You may not attempt to disrupt it, use automated systems to place unreasonable load on it, or republish its content wholesale as your own. Linking to any page here is welcome and needs no permission.

Intellectual property

The text, diagrams and code on this site are ours. Bra size conversion facts are facts and belong to nobody; the particular presentation of them here does not. Brand names mentioned in passing belong to their owners, and no affiliation or endorsement is implied by any mention.

No commercial relationship

This site does not sell anything, take affiliate commission, or receive payment from any retailer or manufacturer. If that changes it will be disclosed prominently, not buried here.

Changes

These terms may be updated; the date at the top will change when they are. Continuing to use the site after a change means accepting the revised terms.

Contact

hello@realbrasizecalculator.com, or the contact page. See also the privacy policy.