Free Health & Nutrition Calculators
Science-based tools to help you understand your body, plan your nutrition, and reach your goals. All calculators are free, private, and require no sign-up.
BMI Calculator
Calculate your Body Mass Index and find your healthy weight range based on height, weight, age, and gender.
Ideal Body Weight
Find your ideal weight range using scientific formulas adjusted for your height, age, and gender.
Daily Calorie Intake
How many calories do you need per day? Get a personalized estimate based on your stats and activity level.
Macro Calculator
Calculate your daily protein, carbs, and fat targets. Try the CalorieJoy smart split method.
Body Fat Percentage
Estimate your body fat using the US Navy method. Get your fat mass, lean mass, and fitness category.
Water Intake
How much water should you drink daily? Get your target based on weight, activity, and climate.
Weight Loss Calculator
Find out how long it will take to reach your goal weight. Get a realistic timeline with adaptive calorie modeling.