BMI, BSA, BMR, Body Fat % & Metabolic Age Calculator

BMI, BSA, BMR, Body Fat % & Metabolic Age Calculator







* BMR, Body Fat % & Body age calculations are approximate and do not use bioelectrical impedance. Results should be used for general guidance only.

Formulas used:

  • BMI (Body Mass Index): weight (kg) / height (m)2
  • BSA (Body Surface Area): Mosteller Formula (√[height(cm) × weight(kg) / 3600])
  • BMR (Basal Metabolic Rate): Mifflin–St Jeor Equation
  • Body Fat % (Body Fat Percentage): U.S. Navy Method
  • Body Age (Metabolic Age): Based on BMR compared to population norms

Measurement Instructions:

  • Neck circumference: just below the Adam’s apple
  • Waist circumference: at the level of the navel for men, smallest waist for women
  • Hip circumference: most widest part of Hip (to measure only in females)