Free Nutrition & Health Calculators
Quick, science-based calculators to understand your body and your nutrition. No signup, instant results — then get personalized plans in the SmartEat app.
Science-based
Instant results
100% free
No signup · private
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 →Related articles
This tool provides general informational estimates only and is not medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional.
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.
