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The result is Total Daily Energy Expenditure or TDEE, which is the daily calorie intake of the person. If you are not sure in which category you fall, it is preferable to go for a lower number. The activity factor will be different for a blue-collar worker, an IT professional, a sportsman and a person who maintains a sedentary lifestyle. The BMR value is then multiplied by an activity factor that varies from 1.2-1.95 depending on the person's physical activity. It varies for men and women.īMR for men = 10 X Weight + 6.25 X Height - 5 X Age + 5īMR for women = 10 X Weight + 6.25 X Height - 5 X Age - 161īMR for men = 13.397 X Weight + 4.799 X Height - 5.677 X Age + 88.362īMR for women = 9.247 X Weight + 3.098 X Height - 4.330 X Age + 447.593 This formula helps to calculate the Basal Metabolic Rate (BMR) or the number of calories a person requires to maintain the body's vital activities. The most common and widely used formula is the Mifflin-St Jeor Equation. Several researchers and scientists have formulated many equations to calculate the exact calories a person has to consume each day. However, the result of a calorie calculator may not be 100% accurate. If you want to know the number of calories you can consume a day to maintain your weight or to gain or lose weight, a calorie calculator will be helpful. Calories are displayed on the nutrition labels of packaged food. Kilo calories or kcal - the scientific term for calorie - is the most commonly used unit in nutrition (1 kcal is equal to 4.18 kilojoules). A calorie is a unit used to measure energy (1 calorie is equivalent to 4.18 joules).