# BMR Calculator

Calculate your **Basal Metabolic Rate (BMR)** with this calculator tool. Your BMR is the amount of energy you expend each day
when at rest.
Gender, age, height and weight are important for this calculation. You have two calculators to choose from:
metric and imperial. You can also choose to use the Mifflin - St Jeor equation (default) or the Harris-Benedict equation.

#### Please note:

The results given by this **BMR calculator** should be used only as a guide and should not replace medical advice. Please bear in mind that,
when interpreting the results of this BMR calculator, other factors such as your lean body mass should be considered. More information on that is available below.

You should always speak to a qualified Doctor or health professional for advice and guidance before making any dramatic changes to your lifestyle.

## What Is BMR?

BMR stands for basal metabolic rate and represents the number of calories you would burn in a day if you were inactive and stayed in bed all day. The BMR calculator allows you to calculate not only the number of calories you burn when inactive, but also a daily calorie figure that takes into account your lifestyle activity level. These two figures together give you a representative figure for your daily calorie intake.

It is important to bear in mind that BMR calculations do not take into account for lean body mass, which will obviously have a factor of its own. Very muscular people, for example, will receive a figure that probably under-estimates their calorie needs and very overweight people will likely get a calculation that over-estimates their calorie requirements.

Let's take a look at the formula for BMR...

## The Mifflin - St Jeor BMR Formula

In 1990, a study by Mifflin MD and St Jeor was published in the American Journal of Clinical Nutrition. It discussed a new predictive equation for resting energy expenditure in healthy individuals, suggesting an update to the existing Harris-Benedict method. The Mifflin - St Jeor equation was said to be more predictive for modern lifestyles and has established itself as the standard for calculating BMR estimates.

The formulae used by this calculator with the **Mifflin - St Jeor equation** are as follows:

Metric BMR formula for men | BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5 |

Imperial BMR formula for men | BMR = (4.536 × weight in pounds) + (15.88 × height in inches) − (5 × age) + 5 |

Metric BMR formula for women | BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161 |

Imperial BMR formula for women | BMR = (4.536 × weight in pounds) + (15.88 × height in inches) − (5 × age) − 161; |

## The Harris-Benedict BMR Formula

The original Harris-Benedict equation was created in 1919 following a study by James Arthur Harris and Francis Gano Benedict. The equations were revised in 1984 using new data, in order to improve accuracy. The Harris-Benedict equation was commonly used for BMR calculations until 1990, when the Mifflin St Jeor equation was published.

The formulae used by this calculator with the **Harris-Benedict equation** are as follows:

Metric BMR formula for men | BMR = 66.47 + ( 13.75 × weight in kg ) + ( 5.003 × height in cm ) − ( 6.755 × age in years ) |

Imperial BMR formula for men | BMR = 66.47 + ( 6.24 × weight in pounds ) + ( 12.7 × height in inches ) − ( 6.755 × age in years ) |

Metric BMR formula for women | BMR = 655.1 + ( 9.563 × weight in kg ) + ( 1.85 × height in cm ) − ( 4.676 × age in years ) |

Imperial BMR formula for women | BMR = 655.1 + ( 4.35 × weight in pounds ) + ( 4.7 × height in inches ) − ( 4.7 × age in years ) |

Other health calculators available on this website include the popular BMI calculator and the WHR calculator.

If you have any problems using this BMR calculator tool, or any suggestions, please contact me.