Free Nutrition & Health Calculators
Quick, science-based calculators to understand your body and nutrition. No signup, live results - then personalize in the SmartEat app.
Suggested path
New here? Start with these three.
All free calculators
Calorie Calculator
Find your daily calorie target for losing, maintaining, or gaining weight.
Open calculator →TDEE & BMR Calculator
Calculate maintenance calories (TDEE) and BMR at rest.
Open calculator →Macro Calculator
Split daily calories into protein, carbs, and fat in grams.
Open calculator →Protein Calculator
Estimate daily protein in grams by weight and goals.
Open calculator →Water Intake Calculator
Daily hydration target by weight, activity, and climate.
Open calculator →BMI Calculator
Check Body Mass Index and weight category.
Open calculator →Pick a calculator
Choose calories, macros, protein, water, BMI, or TDEE.
Get live results
Adjust sliders and chips - numbers update instantly.
Personalize in the app
Turn the numbers into AI meal plans with SmartEat.
Related articles
Get personalized plans in the SmartEat app
These calculators give you a starting point. SmartEat turns the numbers into AI-personalized meal plans and guidance from certified nutritionists.
