Dad-bod doesn’t have to be your bod, check out our calorie-intake calculator below. Simply provide your height, weight, age, and activity level, and receive a personalized target. Determine the calorie intake required to achieve your goals for weight loss or weight gain. Our calculator uses the the Mifflin-St. Jeor equation, which is known as one of the most accurate methods of estimating resting metabolic rate (RMR).