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Evidence-based reading on calories, weight loss and nutrition — no fads, no miracle promises.

How Many Calories Should I Eat to Lose Weight?The simple math behind weight loss, how to pick a safe deficit, and the mistakes that stall most diets.Jul 14, 2026What Is a Calorie Deficit? (And Why It's the Only Way Diets Work)Keto, fasting, low-fat — every diet that works, works the same way. Here's the mechanism.Jul 14, 2026

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Calorie CalculatorHow many calories you need each day to maintain, lose or gain weight.BMI CalculatorBody Mass Index, weight category and your healthy weight range.TDEE CalculatorTotal Daily Energy Expenditure — maintenance calories with activity.BMR CalculatorBasal Metabolic Rate using Mifflin-St Jeor, Harris-Benedict or Katch-McArdle.Body Fat CalculatorBody fat percentage with the U.S. Navy tape method, plus lean mass.Ideal Weight CalculatorIdeal body weight from four peer-reviewed formulas plus the healthy BMI range.Macro CalculatorDaily protein, carbs and fat in grams for your calorie goal and diet style.Calories Burned CalculatorCalories burned by walking, running, cycling and 30+ activities (MET-based).Calorie Deficit CalculatorThe daily deficit you need to reach your goal weight by a target date.