Calorie Calculator Schedule a Free ConsultMeet our team Calorie Calculator Free Tool Calorie Calculator Use this calculator to estimate your daily calorie needs based on your age, sex, height, weight, and activity level. It uses the Mifflin–St Jeor equation, which is widely used for estimating calorie needs in adults. Age Sex Female Male Weight (lb) Height Activity Level Sedentary (little or no exercise) Lightly active (light exercise 1–3 days/week) Moderately active (moderate exercise 3–5 days/week) Very active (hard exercise 6–7 days/week) Extra active (very hard exercise + physical job) Calculate Calories Reset Formula used: Mifflin–St Jeor. Maintenance calories are calculated by multiplying BMR by an activity factor. Fat-loss targets shown below use a 15% and 20% calorie reduction.