Health

Calculate your Body Mass Index (BMI) using your height and weight. Get the WHO category classification (underweight, healthy, overweight, obese) with a color-coded indicator. The tool also shows your healthy weight range for your height and how far you are from it. Supports both metric (cm/kg) and imperial (ft·in/lb) units, plus an Asian-population threshold option with lower obesity cutoffs.

Estimate your biological age — how old your body 'really is' based on lifestyle factors versus your chronological age. This calculator uses a points-based model derived from longitudinal cohort studies (Framingham, Whitehall II) to estimate how your habits impact aging. Factors include sleep, exercise, diet, smoking, alcohol, stress, BMI, and social connections. The result shows your estimated body age plus which habits help or hurt most.

Estimate body fat percentage using the US Navy circumference method — validated to within ±3-4% of DXA scans, requiring only a tape measure. Different formulas for men (neck + waist) and women (neck + waist + hip) account for gender differences in fat distribution. Get your body fat category, lean mass, and fat mass breakdown.

Calculate your daily calorie needs based on your physiology and activity level. Get Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation — the most accurate formula for the general population. Then see Total Daily Energy Expenditure (TDEE) with activity multiplier. Pick your goal (cut, maintain, bulk) and receive calorie targets plus macro split recommendations for protein, carbs, and fat in grams.