Use our Harris Benedict Formula Calculator as a BMR Calculator to lose weight or provides an easy way to find out the calories your body burns while at rest. This calculator also incorporates and provides your BMR as per the Harris-Benedict formula which is a standard modification of the BMR to determine your daily calorie requirements.
How BMR Harris Benedict Calculator Works?
The BMR Harris Benedict Calculator estimates the number of calories required to maintain an individual’s basal metabolic rate (BMR), which is the energy the body needs at rest. The calculator uses an individual’s weight, height, age, and sex to determine their BMR. The Harris Benedict equation then factors in an individual’s activity level to determine their total daily energy expenditure (TDEE). The BMR Harris Benedict Calculator provides a useful tool for individuals looking to track their calorie intake and maintain a healthy weight.
Harris Benedict Equation Explainer Video
What is BMR ?
Wikipedia defines Basal metabolic rate (BMR) as the rate of energy expenditure per unit time by endothermic animals at rest. It is reported in energy units per unit time ranging from watt (joule/second) to ml O2/min or joule per hour per kg body mass J/(h·kg). It is estimated that a person’s BMR accounts for roughly 60 to 75% of your daily calorie expenditure.
- Liver: 25%
- Brain: 19%
- Skeletal Muscle: 18%
- Kidneys: 10%
- Heart: 7%
- Other Organs: 19%
What affects BMR calculations ?
BMR is affected by the intrinsic factors like weight, height, surface area, gender, body composition, body temperature, age, hormone levels, and overall health. So it varies person to person
- Metabolic rates increase with an increase in body weight, height, and surface area.
- Metabolic rates are lower in fat tissues than muscle tissue.
- Metabolic rates are lower in women than men.
- Metabolic rates decrease with age.
- Metabolic rates increase with an increase in body temperature.
- Metabolic rates vary in response to T4 hormone levels. T4 is the key hormone released by your thyroid glands and has a significant effect on body weight.
- Metabolic rates increase with a decrease in overall health.
What is the Harris-Benedict formula?
Our BMR calculator can also be called Harris Benedict Formula Calculator because it includes computation of modified BMR based on the Harris–Benedict equation which is used for determining the individual’s BMR based on an individual’s activity level. The modified BMR as per the Harris-Benedict equation is the approximate daily kilocalorie intake to maintain current body weight. The Harris-Benedict equation helps a lot in an effort to weight loss by reducing the calorie intake from the estimated BMR found out through the HB equation.
Harris-Benedict Equation History
The Harris-Benedict Equation was first developed in 1919 by American scientists James Harris and Francis Benedict. The formula is based on an individual’s age, weight, height, and gender, and it calculates BMR by taking into account the energy expended through physical activity. The Harris Benedict formula has been widely used since its inception and is still considered to be a reliable method for calculating BMR.
The Harris Benedict formula is expressed as follows:
- BMR = 66 + (6.23 x weight in pounds) + (12.7 x height in inches) – (6.8 x age in years)
- For men: BMR = 88.4 + (13.4 x weight in kilograms) + (4.8 x height in centimeters) – (5.68 x age in years)
- For women: BMR = 447.6 + (9.25 x weight in kilograms) + (3.10 x height in centimeters) – (4.33 x age in years)
The Harris Benedict formula is a good starting point for calculating BMR, but it is important to note that it is an estimate and not an exact measurement. Several factors can affect an individual’s BMR, including genetics, body composition, and physical activity levels. Therefore, the formula should be used as a guide and not a definitive measurement.
How to Compute TDEE by Harris-Benedict Formula ?
The Harris-Benedict Equation finds out the Total Daily Energy Expenditure or TDEE . In order to calculate the number of calories required for weight loss, gain, or maintenance, one needs to adjust the BMR using the appropriate activity factor. The activity factor takes into account an individual’s physical activity level, from sedentary to very active. The following are the activity factors:
- Sedentary (little or no exercise): BMR x 1.2
- Lightly active (exercise 1-3 times per week): BMR x 1.375
- Moderately active (exercise 3-5 times per week): BMR x 1.55
- Very active (exercise 6-7 times per week): BMR x 1.725
- Extra active (very hard exercise or physical job): BMR x 1.9
For example, if an individual has a BMR of 1500 calories and is lightly active, they would need to consume 1500 x 1.375 = 2062.5 calories per day to maintain their weight.
The Harris Benedict formula is a useful tool for estimating an individual’s BMR and determining their daily calorie requirements (popularly known as TDEE ). While it is not an exact measurement, it provides a good starting point for creating a personalized diet and exercise plan. It is important to remember that other factors, such as body composition and genetics, can affect an individual’s BMR, and consulting a healthcare professional or registered dietitian is always recommended for personalized advice.
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