Free Nutrition & Health Calculators
Quick, science-based calculators to understand your body and nutrition. No signup, live results - then personalize in the SmartEat app.
Science-based
Instant results
100% free
No signup · private
Browse calculators
Suggested path
New here? Start with these three.
All free calculators
Popular
Calorie Calculator
Find your daily calorie target for losing, maintaining, or gaining weight.
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Popular
Calorie Deficit Calculator
Daily deficit plus a week-by-week timeline to your goal. Capped at 0.5 to 1 kg per week.
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Popular
Nutri-Score & NOVA Checker
Paste per 100 g or a barcode. Get A-E plus ultra-processed yes/no.
Open calculatorTDEE & BMR Calculator
Calculate maintenance calories (TDEE) and BMR at rest.
Open calculatorMacro Calculator
Split daily calories into protein, carbs, and fat in grams.
Open calculatorProtein Calculator
Estimate daily protein in grams by weight and goals.
Open calculatorWater Intake Calculator
Daily hydration target by weight, activity, and climate.
Open calculatorBMI Calculator
Check Body Mass Index and weight category.
Open calculatorPick a calculator
Choose calories, a loss timeline, Nutri-Score, 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
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.
