Excessive weight loss can also be due to dehydration, which is unhealthy. Losing more than 2 pounds a week will likely involve muscle loss, which in turn lowers BMR, since more muscle mass results in higher BMR. It is inadvisable to lower calorie intake by more than 1,000 calories per day, as losing more than 2 pounds per week can be unhealthy, and can result in the opposite effect in the near future by reducing metabolism. It is important to remember that proper diet and exercise is largely accepted as the best way to lose weight. For example, if a person has an estimated allotment of 2,500 calories per day to maintain body-weight, consuming 2,000 calories per day for one week would theoretically result in 3,500 calories (or 1 pound) lost during the period. As such, in order to lose 1 pound per week, it is recommended that 500 calories be shaved off the estimate of calories necessary for weight maintenance per day. 1 pound, or approximately 0.45 kg, equates to about 3,500 calories. This value is multiplied by an activity factor (generally 1.2-1.95), dependent on a person's typical levels of exercise, in order to obtain a more realistic value for maintaining body-weight (since people are less likely to be at rest throughout the course of an entire day). The value obtained from these equations is the estimated number of calories a person can consume in a day to maintain their body-weight, assuming they remain at rest. The three equations used by the calculator are listed below: Of these equations, the Mifflin-St Jeor Equation is considered the most accurate equation for calculating BMR with the exception that the Katch-McArdle Formula can be more accurate for people who are leaner and know their body fat percentage. The Katch-McArdle Formula is slightly different in that it calculates resting daily energy expenditure (RDEE), which takes lean body mass into account, something that neither the Mifflin-St Jeor nor the Harris-Benedict Equation do.

The Mifflin-St Jeor Equation also calculates BMR, and has been shown to be more accurate than the revised Harris-Benedict Equation. It was revised in 1984 to be more accurate and was used up until 1990, when the Mifflin-St Jeor Equation was introduced. The Harris-Benedict Equation was one of the earliest equations used to calculate basal metabolic rate (BMR), which is the amount of energy expended per day at rest. This Calorie Calculator is based on several equations, and the results of the calculator are based on an estimated average. Related: BMI Calculator | Body Fat Calculator | Ideal Weight Calculator The following converter can be used to convert between Calories and other common food energy units. Very intense exercise: 2+ hours of elevated heart rate activity.Intense exercise: 45-120 minutes of elevated heart rate activity.Exercise: 15-30 minutes of elevated heart rate activity.

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