Pregnancy Weight Gain Calculator

The Pregnancy Weight Gain Calculator will recommend the ideal weight range for your pregnancy based on your height and weight before pregnancy. This calculator is based on the most recent guidelines for pregnancy weight gain issued by the Institute of Medicine (IOM) in May 2009.

Your Current Pregnancy Stage
Pregnant with Twins No   Yes
Your Height feet inches
Your Weight Before Pregnancy pounds (lb)
Your Height centimeters
Your Weight Before Pregnancy kilograms

Caloric intake must be increased to ensure proper development of the fetus during pregnancy. The amount of weight gained varies among women. Insufficient weight gain can compromise the health of the fetus and cause preterm, or premature, birth. Likewise, excessive weight gain can pose risks to the mother and the fetus, cause labor complications, or increase the risk of having a Cesarean delivery, etc. Women who are overweight may choose to plan a healthy diet and exercise regimen to help control the amount of weight they gain.

Recommendations for Total Weight Gain During Pregnancy by Prepregnancy BMI*

BMI (kg/m2)
Category Total Weight
Gain Range
Total Weight Gain Range
for Pregnancy with Twins
<18.5 Underweight 28-40 lbs  
18.5-24.9 Normal Weight 25-35 lbs 37-54 lbs
25.0-29.9 Overweight 15-25 lbs 31-50 lbs
>30.0 Obese 11-20 lbs 25-42 lbs

* Weight Gain During Pregnancy: Reexamining the Guidelines, The Institute of Medicine of the National Academies, May 28, 2009