wikiHow Calories Burned Calculator There are various factors that can influence the number of calories burned in a day, such as age, gender, body weight, height, activity level, and metabolic rate. However, a commonly used formula to estimate daily calorie expenditure is the Harris-Benedict equation: For men: BMR = 88.36 + (13.4 x weight in kg) + (4.8 x height in cm) - (5.7 x age in years) For women: BMR = 447.6 + (9.2 x weight in kg) + (3.1 x height in cm) - (4.3 x age in years) After you have calculated your basal metabolic rate (BMR), you can then multiply it by a physical activity level factor (PAL) to estimate your daily calorie expenditure. The PAL factor ranges from 1.2 for sedentary individuals to 2.4 for highly active individuals. Here is an example of how to use the Harris-Benedict equation to calculate daily calorie expenditure: For a 35-year-old man who weighs 75 kg and is 175 cm tall, the BMR calculation would be: BMR = 88.36 + (13.4 x 75) + (4.8 x 175) - (5.7 x 35) = 1,840.26 calories per day To estimate the daily calorie expenditure based on a moderately active lifestyle (PAL factor of 1.55), the calculation would be: Daily Calorie Expenditure = 1,840.26 x 1.55 = 2,851.39 calories per day. Again, this is just an estimate and the actual number of calories burned can vary based on individual factors. Page