Evidence-based, dietitian-approved calculators and interactive experiences — all free, instant, and designed to help you make smarter decisions about your health.
Ask our AI dietitian anything about nutrition, meal planning, food labels, supplement safety, or your specific health goals. Get evidence-based answers in seconds — available 24/7.
Chat now →Work through real-world patient case studies covering lab interpretation, deficiencies, metabolic conditions, and more. Earn a certificate if you score 80%+. Built for RDs, students, and nutrition enthusiasts.
Play now →Calculate your Basal Metabolic Rate using the Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formula. Understand your resting calorie needs with step-by-step explanations.
Calculate BMR → Energy & GoalsFind your Total Daily Energy Expenditure and get personalized calorie targets for weight loss, maintenance, or muscle gain — plus a full macronutrient breakdown.
Calculate TDEE → Body CompositionCalculate your Body Mass Index and understand your weight category. Includes an honest breakdown of BMI's clinical limitations that every dietitian knows.
Calculate BMI → HydrationGet a personalized daily water intake goal adjusted for your weight, activity level, climate, and pregnancy or breastfeeding status. See your target in litres, cups, and bottles.
Calculate water needs → Clinical ToolCalculate Ideal Body Weight using Hamwi, Devine, and Robinson formulas. Automatically determines Adjusted Body Weight (ABW) when clinically indicated — essential for RD practice.
Calculate IBW →