This Basal Energy Expenditure calculator computes the amount of energy that your body needs to sustain its normal functions, from respiration to heart beat. Below the form you can find the formulas used, an example calculation and more on BEE.

Unit system:*

## How does this basal energy expenditure calculator work?

This is a health tool allowing you to see exactly how many calories a day your body requires to support its basic metabolic functions. This is the minimum of calories you ought to consume to ensure your body has the minimum resources. When talking about basic energy expenditure we can refer to the same amount of energy our body uses when sleeping, but in day to day activities, we require a lot more than that.

This basal energy expenditure calculator asks you to input your age, gender, weight and height, the last two you can input either in English or metric measurements and of course you can make as many calculation as you like with any variables.

The BEE formulas based on the work of Harris and Benedict, used with English units: lbs and inches are presented below.

Female: BMR = 655 + (4.35 x weight in lbs) + (4.7 x height in inches) - (4.7 x age in years)

Male: BMR = 66 + (6.23 x weight in lbs) + (12.7 x height in inches) - (6.8 x age in years)

## Example calculation

For a male, aged 29, weighing 191 lbs at a height of 6ft 4in:

The BEE value is 2,024 calories/day. This means that he needs at least this amount of daily caloric intake just to support the basic functions of his body.

## Basal metabolic rate

Is the same with the basal energy expenditure and represents the amount of energy you need when resting in order to support all the vital functions when at rest without any stress factors. This caloric need is roughly 70% of the calories burned each day. These measurements are now used to evaluate the metabolic status and prepare weight loss plans.

- Heart beat and pumping blood

- Nervous system

- Respiration

- Temperature regulation

- Muscle contraction relaxation

- and many moreā¦

## Factors affecting BEE

BEE is a measure of the individual metabolic status and takes account of factors such as weight and height, exercise routine and also a series of medical conditions. Other factors include:

- Age – metabolic rate is higher during the rapid growth period and it decreases, with a rapid rate after the age of 40 because of the decrease in lean mass that is replaced with body fat.

- Gender – as women have more body fat than lean muscle, they tend to have a lower metabolic rate than men.

- Body composition – the more muscle the higher the metabolic rate is, even at rest because muscle tissue e burns up to 5 times more calories than fat.

- Body surface area – the greater the surface the higher the rate, therefore even tall and thin people tend to have higher BEEs.

- Hormonal function – hormones such as the thyroid or cortisol are regulators of the metabolic rate. Thyroid hormones are responsible with the regulation of the rate, if they are too high, then the metabolic rate increases.

- Eating habits – starvation or long periods of dieting can decrease the BEE.

- Medication – certain medicines may affect the metabolic processes.

- Heredity

- Thermal regulation

## References

1) Mifflin, MD; St Jeor, ST; Hill, LA; Scott, BJ; Daugherty, SA; Koh, YO (1990) . The American journal of clinical nutrition; 51 (2): 241–7.

2) Harris J, Benedict F (1918) PNAS; 4 (12): 370–3.

19 May, 2015