The Harris Benedict Equation is a formula that uses the variables of height, weight, age, and gender to calculate a basal metabolic rate (BMR). This is more accurate than calculating energy needs based on total body weight alone.

The only factor it omits is lean body mass and thus the ratio of muscle-to-fat a body has. Remember, leaner bodies need more energy than less lean ones. Therefore, this equation will be accurate in all people except the very muscular (Harris-Benedict will under-estimate energy needs) and overweight people (Harris-Benedict will over-estimate energy needs).

Calculate your Daily Energy Needs

Use the Daily Energy Needs Calculator to determine your average daily energy requirement.

Results

Results will show the amount of kilojoules required to maintain current body weight, taking into account your weight, height, age and energy needs.