A daily calorie calculator can be used to calculate the number of calories a person should consume each day. This calculator can be used to gain or lose weight. This daily calorie calculator is based on several equations, Weight loss Daily Calorie Calculator, and the calculator results are calculated averages. The Harris-Benedict equation was modified to be more accurate in 1984 and was used until 1990, when the Mifflin-Saint-Gel equation was introduced as a calorie calculator for daily caloric intake.