Util Tools Free Health & Fitness Calculators Online
BMI, calorie/TDEE, body fat, ideal weight, and macro calculators with science-based formulas.
BMI Calculator
Body Mass Index with gauge, categories, and healthy weight range.
Open tool →Calorie & TDEE Calculator
BMR, TDEE, goal calories, and macro split across 4 formulas.
Open tool →Body Fat Calculator
Navy, BMI, and skinfold methods with lean vs fat mass.
Open tool →Ideal Weight Calculator
Five ideal-weight formulas plus a healthy BMI range.
Open tool →Macro Calculator
Protein, carb, and fat targets for keto, low-carb, and balanced diets.
Open tool →Free health and fitness calculators
These calculators turn your measurements into useful, science-based estimates: Body Mass Index and healthy weight range, body fat percentage by several methods, daily calorie needs (BMR and TDEE) using research formulas, ideal body weight across multiple equations, and macronutrient targets for different diet styles. Each explains the formula it uses and the assumptions behind it.
Numbers like these are most helpful as a starting point and a way to track change over time, not as a verdict. Formulas estimate averages, and real bodies vary, so use the results to set sensible targets and watch the trend rather than fixating on a single figure.
An important note
These tools are for general information and education only and are not medical advice. For decisions about your health, weight, or diet, consult a qualified healthcare professional. Pick a calculator above to begin.