The Calorie Calculator can now be used to estimate the number of calories a person needs to consume every single day. This calculator can also provide some simple guidelines for gaining or losing weight, beneficial for people with thyroid.

This Calorie Calculator is based on several mathematical equations and the results of the calculator are based on an estimated simple average.

The Harris-Benedict Equation was one of the earliest equations that has been used to calculate the basal metabolic rate (BMR), which is commonly known as the amount of energy expended per day at rest.

The Mifflin-St Jeor Equation is another format that also calculates BMR and has been shown to be more precise than the revised Harris-Benedict Equation method.

The Katch-McArdle Formula is a third in this category, which is slightly different in its calculations. This is because it computes the resting daily energy expenditure (RDEE), which takes lean body mass into consideration. This is something that neither the Mifflin-St Jeor nor the Harris-Benedict Equation do.

Of these equations, the Mifflin-St Jeor Equation is considered to be the most accurate equation for calculating BMR. The exception here is that the Katch-McArdle Formula can sometimes be more accurate for people who are leaner and know their body fat percentage.