Skip to content
VitaCalculator

Methodology

Transparent by default.

A health number is only useful if you can trust where it came from. Here is exactly how we build ours.

We cite the formulas

Every calculation is backed by a named, published equation or an internationally recognized standard. The exact formula appears on each calculator page.

We cite our sources

We link directly to the primary sources — WHO publications, peer-reviewed papers, and government health agencies — so you can verify the basis of any result.

We don't give medical advice

VitaCalculator is an educational tool. We do not diagnose, treat, or make personal health recommendations. For that, consult a qualified professional.

Calculations run locally

All math happens in your browser using client-side JavaScript. Your measurements are never sent to a server, logged, or stored.

Standards we rely on

  • WHO BMI Classification BMI categories and the healthy weight range.
  • Mifflin-St Jeor Equation Basal Metabolic Rate (BMR) and the basis for TDEE.
  • Activity Multipliers Converting BMR into Total Daily Energy Expenditure.
  • Devine, Robinson & Miller Ideal body weight reference estimates.
  • WHO Waist-Hip Ratio WHR calculation and sex-specific risk thresholds.

This calculator provides estimates based on published formulas and methodologies. Results are for educational and informational purposes only and should not be considered medical advice.