Calculate your BMR. BMR or Basal Metabolic Rate is the number of calories needed for the basic processes of life. BMR Calculator will help you know the number of calories you need daily to maintain your weight. BMR is individual. Your BMR is influenced by a number of factors: gender, age, height, weight, body composition, stress, environmental temperature and other. Men usually have a higher BMR than women. BMR Calculator takes into consideration your activity level. If you want to lose weight, you can reduce your daily calorie intake by going on a low calorie diet and/or do physical exercises. However, make sure you consult your doctor first.