What the tool does, how to run it, and what to expect from the result.
Find your bra size from an underbust and a bust measurement, in inches or centimeters, with the US and UK cup and two sister sizes. It is an estimate for general guidance and is not medical advice; talk to a professional for personal health decisions.
A quick way to understand who this helps, what it solves, and where it connects next.
People tracking fitness, nutrition, and everyday health goals.
A quick, private health estimate without an account or app install.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is completely free, with no sign-up, no watermark, and no usage limits.
No. Everything runs locally in your browser, so your details never leave your device and the tool works offline.
Measure snugly around your ribcage just under the bust for the band, then loosely around the fullest part of the bust with the tape level. Round the band to the nearest even number; each inch of difference between bust and band is one cup size.
A size with the same cup volume on a different band: go one band down and one cup up, or one band up and one cup down. 32D, 30DD and 34C hold the same volume.
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Enter your numbers and the result updates live in your browser. Nothing is uploaded and no server is used.
Calculations run locally in your browser; nothing is uploaded. An estimate, not medical advice.