All Health and Fitness Calculators
Free, private, science-based tools for BMI, body fat, calories, TDEE, macros, and more.
All 12 Calculators
Choose from our collection of free, private body and health calculators. All calculations happen in your browser — your measurements are never sent to a server.
BMI Calculator
Calculate your Body Mass Index based on height and weight
Body Fat Calculator
Estimate your body fat percentage using measurements
Waist-to-Hip Ratio
Assess health risks based on body shape measurements
Lean Body Mass
Calculate your lean mass vs fat mass composition
Body Age Calculator
Lifestyle-based body-age score (not a clinical biological age)
Ideal Weight Calculator
Find your ideal body weight using multiple formulas
Calorie Calculator
Calculate daily calorie needs for your goals
BMR & TDEE Calculator
Find your basal metabolic rate and total daily expenditure
Calorie Burn Calculator
Calculate calories burned during any activity
Water Intake Calculator
Calculate recommended daily water consumption
Macro Calculator
Get your ideal protein, carbs, and fat breakdown
Protein Calculator
Calculate your optimal daily protein intake