The Calorie Calculator is a comprehensive nutritional utility designed to help you determine your daily energy requirements based on your unique physiological profile and activity level. Understanding your daily calorie burn is the foundation of any successful weight management plan, whether your goal is weight loss, maintenance, or muscle gain. Our tool utilizes the scientifically-validated Mifflin-St Jeor equation, which is widely considered the most accurate formula for estimating Basal Metabolic Rate (BMR)—the number of calories your body needs to function at rest. By factoring in your age, gender, weight, height, and daily activity level (from sedentary to extra active), the calculator determines your Total Daily Energy Expenditure (TDEE). The results provide clear recommendations for daily calorie intake adjusted for different goals, such as losing 0.5kg or 1kg per week. All processing occurs locally in your browser using client-side JavaScript, ensuring that your personal health metrics remain completely private and are never transmitted to a server. Whether you're a professional athlete fine-tuning your performance, a fitness enthusiast tracking progress, or someone simply looking to lead a healthier lifestyle, this tool provides the precision and privacy needed for informed nutritional planning.