How is BMR calculated per hour?

The correct approach to calculating Basal Metabolic Rate (BMR) involves understanding the relationship between body weight and energy expenditure. BMR essentially represents the number of calories the body requires to maintain basic physiological functions while at rest over a specific time frame, typically expressed in calories per day.

The method of using weight in kilograms is relevant because many BMR formulas, such as the Mifflin-St Jeor equation, include weight in kilograms as a crucial component in determining daily caloric needs. When BMR is calculated on an hourly basis, it can be derived from the daily BMR by dividing the daily caloric requirement by 24 (the number of hours in a day).

This emphasis on weight in kilograms is critical for accurate calculations, as it aligns with standard scientific practices and allows for consistency when estimating metabolic rates among different individuals or populations.

The other methods listed do not accurately reflect the established ways of calculating BMR. Using age times weight or BMI in the way suggested does not directly yield a measure of caloric needs in an appropriate manner. Therefore, relying on weight in kilograms is the most accurate and scientifically grounded method for determining BMR.