Calorie Calculator

It's a reasonable approximation based on the energy content of a pound of fat tissue (roughly 3,500 kcal). However, real weight loss is more complex — water retention, glycogen changes, and metabolic adaptation mean you won't lose exactly 1 lb per week of pure fat. The formula is useful for setting a starting target, not predicting exact results.

For weight management, calories in vs. calories out is the primary driver — a calorie deficit causes weight loss regardless of food source. However, food quality profoundly affects satiety, muscle retention, energy levels, health markers, and sustainability. High-protein, high-fiber diets make maintaining a deficit much easier.

Weight loss plateaus happen because: (1) your lighter body needs fewer calories, (2) metabolic adaptation reduces BMR, and (3) unconscious reductions in non-exercise movement (NEAT). Recalculate your target every 10–15 lbs lost, and consider adding 1–2 weeks of maintenance eating to reset hormones before continuing.