Basal Metabolic Rate(BMR) Calculator

Hazim Hanif

February 24, 2017

Introduction to Basal Metabolic Rate(BMR)

Basal Metabolic Rate(BMR) is the amount of energy (in the form of calories) that the body needs to function while resting for 24 hours is known as the basal metabolic rate.
This number of calories reflects how much energy our body requires to support vital body functions if, hypothetically, we were resting in bed for an entire day.
BMR is the single largest component (upwards of 60 percent) of our total energy burned each day.
Metabolism comprises the processes that the body needs to function.
Some of those processes are breathing, blood circulation, controlling body temperature, cell growth, brain and nerve function, and contraction of muscles.

For the calculation, we are using the Mifflin & St Jeor Formula to calculate BMR.
Example info:

weight<-60; height<-1.65; age<-26;

(10*weight) + (6.25*height) - (5*age) + 5

## [1] 485.3125

(10*weight) + (6.25*height) - (5*age) - 161

## [1] 319.3125

These are all the rules to calculate the recommende intake based on activity type:

Little to no exercise Daily kilocalories needed = BMR x 1.2
Light exercise (1-3 days per week) Daily kilocalories needed = BMR x 1.375
Moderate exercise (3-5 days per week) Daily kilocalories needed = BMR x 1.55
Heavy exercise (6-7 days per week) Daily kilocalories needed = BMR x 1.725
Very heavy exercise (twice per day, extra heavy workouts) Daily kilocalories needed = BMR x 1.9

#Example info
weight<-60; height<-1.65; age<-26;

#Calculate the BMR
BMR<-(10*weight) + (6.25*height) - (5*age) + 5
BMR

## [1] 485.3125

#Recommended Intake for Moderate Exercise (Kilocalories)
BMR*1.55

## [1] 752.2344