Free health and fitness calculators for BMI, body fat, calories, macros, heart rate and pace — each names its equation and cites its sources.
These health and fitness calculators identify the equation or method each tool uses and cite authoritative sources where appropriate. They are educational tools for understanding your numbers — not a substitute for professional medical advice, diagnosis or treatment. Always consult a qualified clinician for health decisions.
Body Mass Index with units toggle.
US Navy body fat formula.
US Army circumference method.
Devine target weight.
Muscle and organ mass.
Body fat distribution risk.
BSA (Mosteller).
Basal metabolic rate (Mifflin).
Total daily energy expenditure.
Daily calorie target for a goal.
Calorie split into macros.
Daily protein target.
Daily carb target.
Daily hydration target.
No. They are educational estimators that identify the formula they use. They do not diagnose any condition and are not a substitute for professional medical advice. See a qualified clinician for decisions about your health.
Each calculator names its method on its page — for example BMI uses weight/height², BMR uses Mifflin-St Jeor, body fat uses the U.S. Navy circumference method, and eGFR names the specific equation applied.
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