6 free tools
Health & Fitness calculators
Explore health & fitness tools with adjustable inputs, formulas, assumptions and worked examples. Choose a calculator below to see its method and limits.
BMI Calculator
Calculate Body Mass Index and understand your weight category.
Open calculator →Target Heart Rate Zones
Calculate all five heart rate training zones from your age and resting HR.
Open calculator →Calorie Deficit
How long will it take to reach your goal weight at a given calorie deficit?
Open calculator →Water Intake Calculator
Calculate your personalized daily water intake goal based on weight and activity.
Open calculator →BMR Calculator
Calculate your Basal Metabolic Rate — calories burned at complete rest.
Open calculator →Protein Intake Calculator
Calculate your optimal daily protein intake based on goal and body weight.
Open calculator →