Editorial Policy

Every calculator and guide on this site follows the same rules:

  • Primary sources only. Formulas and health claims cite peer-reviewed research or official guidelines (CDC, WHO, U.S. Dietary Guidelines).
  • Dates you can trust. Each page shows when it was last updated, and we re-verify references periodically.
  • Clear limits. Calculators produce estimates for education. They are not medical advice, and we say so on every page.
  • No pay-to-say. Advertisers never influence results, rankings or recommendations.

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