Free, interactive calculators built on science-backed formulas to help you understand your body and reach your goals.
Calculate your Basal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formulas. Supports metric and imperial units.
Calculate BMR →Find out your Total Daily Energy Expenditure based on your BMR and activity level — the number of calories you actually burn each day.
Calculate TDEE →Calculate your Body Mass Index and understand what it means in the context of overall health — with important caveats explained.
Calculate BMI →Estimate your Ideal Body Weight using the Devine Formula — the clinical standard used in nutrition and pharmacy dosing. Includes healthy weight range and current-weight comparison.
Calculate IBW →Estimate your daily water needs using three clinical methods: 30–35 mL/kg, Holiday-Segar, and 1 mL/kcal. Adjusts for activity level and climate.
Calculate Water Needs →Generate a personalized day of meals powered by GPT-4o. Enter your calorie goal, diet type, and restrictions — get a full plan in seconds.
Generate Meal Plan →