Health Calculators

Pregnancy Weight Gain Calculator

If you started your pregnancy at a healthy weight, by the time you give birth you will have gained between 25 and 35 pounds -- and probably only 7 to 8 pounds of that will be the baby itself. What accounts for the extra pregnancy weight gain? Everything from amniotic fluid (2 pounds) to an increased blood supply (4 pounds). Keeping your pregnancy weight gain in check can be a challenge. Use our pregnancy weight gain calculator below to find out if your weight gain is on target for your pregnancy.


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

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