refraft is free educational reference material. Using it means accepting the short list of terms below.
The calculators, articles, and any output produced by this site are for general educational and informational purposes only. They are not medical advice, diagnosis, or treatment, and they do not establish a doctor-patient relationship of any kind. Always consult a qualified healthcare professional before making decisions about your diet, exercise, weight, or health — especially if you have a chronic condition, are pregnant or breastfeeding, are under 18, or have a history of disordered eating.
The formulas used (Mifflin-St Jeor, U.S. Navy circumference method, Devine / Robinson / Miller / Hamwi, WHO and NICE thresholds, Wishnofsky approximation, and others) are population-level estimates with known limitations, which we describe on each calculator's page. Real biology varies. Treat every number on this site as an estimate, not a measurement.
The site is provided “as is” without warranties of any kind, express or implied, including warranties of accuracy, fitness for a particular purpose, or non-infringement. We do not guarantee the site will be available, error-free, or up-to-date.
To the maximum extent permitted by law, the operators of refraft are not liable for any damages arising from your use of, or inability to use, this site or anything you decide to do (or not do) based on its content. You use the site at your own risk.
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These terms may be updated from time to time. The current version will always live at this URL.
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Last updated: April 28, 2026.