Pregnancy Weight Gain Calculator

How much weight a woman should gain during pregnancy depends on how much she weighed before conceiving and how appropriate that weight is for her height as expressed by the "body mass index," or BMI

The guidelines for pregnancy weight gain are issued by the Institute of Medicine (IOM).

• A woman with a healthy pre-pregnancy weight relative to her height (BMI of 18.5 to 24.9), should gain between between 16kg and 24kg.
  
• An underweight woman (BMI below 18.5), should gain between 12.5kg and 18kg.
  
• An overweight woman (BMI of 25 to 29.9), should gain between 14kg and 23kg.
  
• An obese woman (BMI of over 30), should gain between 11kg and 19kg.
  

The calculator takes 2 inputs:

• Pre-pregnancy height (in cm)
• Pre-pregnancy weight (in kg)

The user selects the relevant values using a sidebar panel.

The user's BMI is calculated in the main panel using the following formula:

pBMI<-function(Weight,Height) {
        if (Weight==0 | Height==0) return(NA)
        else  return(round(Weight/(Height/100)^2,1))
}

The user's recommended pregnancy weight gain is printed out below the BMI figure.

Thank you

Visit the following URL to see the finished product

Pregnancy Weight Gain Calculator

The code is also available on github

Github Code

For more information on weight gain during pregnancy visit

Weight Gain During Pregnancy Reexamining the Guidelines