Free Fitness & Health Calculators

Science-based tools to help you track and improve your health — free, fast, and private.

10 Free Calculators Science-Based No Sign-Up Data Stays on Device

Body Composition

Body Mass Index with WHO categories and healthy range.

Basal metabolic rate at rest using Mifflin-St Jeor.

Total daily energy expenditure by activity level.

US Navy circumference method with ACE categories.

Average of Robinson, Miller, Devine, and Hamwi.

BMI-based healthy weight range for your height.

Daily calorie target with macronutrient split.

Protein, carbs & fat for 4 diet types.

5 heart rate zones using the Karvonen method.

31 activities with MET-based calorie burn.