🔥BMR Calculator Basal metabolic rate: Mifflin–St Jeor and Harris–Benedict, kJ, PAL/TDEE table, WHO BMI bands — metric or imperial, reference chart. How To Use: Choose units, then enter height, weight, age, and sex. Pick the primary equation (Mifflin–St Jeor is the default used in many clinical guidelines; revised Harris–Benedict is shown for comparison). You get BMR in kcal/day and kilojoules, BMI, a TDEE table using standard physical activity level (PAL) factors, and a kcal reference band chart after you calculate. Why Use This Tool Evidence-based resting energy equations with dual-unit input, PAL multipliers consistent with FAO/WHO/UNU-style energy requirement reporting, and clear medical disclaimers—educational, not a substitute for professional assessment.