Free Nutrition Calculators & Tools
Science-backed nutrition and fitness calculators you can use for free — and embed on your own site.
Calorie & Nutrition Calculators
TDEE & Calorie Calculator
Find your Total Daily Energy Expenditure and the right calorie target for weight loss, maintenance, or gain.
Calculate Now →Macro Calculator
Get your ideal daily protein, carbs, and fat split based on your calorie target and goal.
Calculate Now →Protein Intake Calculator
Find your optimal daily protein based on body weight, activity, and fitness goals.
Calculate Now →Calorie Deficit Calculator
Calculate a safe deficit with timeline projections showing how long it takes to reach your goal.
Calculate Now →Body Composition & Health
BMI Calculator
Calculate your Body Mass Index with health context, visual scale, and an honest look at its limitations.
Calculate Now →Body Fat % Calculator
Estimate body fat percentage using the U.S. Navy method — just a tape measure, no special equipment.
Calculate Now →Ideal Weight Calculator
Compare your ideal weight across four clinical formulas: Devine, Robinson, Miller, and Hamwi.
Calculate Now →Lifestyle & Planning
Quizzes & Analysis Tools
Diet Compatibility Quiz
Answer 8 quick questions and discover the eating style that fits your goals, preferences, and lifestyle. Shareable results!
Take the Quiz →Supplement Interaction Checker
Select your supplements and check for absorption conflicts, dangerous interactions, and optimal timing schedules.
Check Interactions →Fridge Nutrition Audit
Pick the foods in your kitchen and get a nutrition coverage score. See which vitamins and minerals you're missing.
Audit My Kitchen →
Track your nutrition with Gram
Snap a photo of your meal and let AI do the rest. Track calories, macros, and micronutrients effortlessly.