Pregnancy Weight Gain Calculator
The Pregnancy Weight Gain Calculator estimates a schedule for healthy weight gain based on weight gain guidelines from the Institute of Medicine and height and weight measurements before pregnancy.
|Your Weight Before Pregnancy||pounds|
|Your Weight Now||pounds|
|Your Weight Before Pregnancy||kg|
|Your Weight Now||kg|
Recommended Weight Gain
While weight gain during pregnancy is normal and necessary, studies have shown that certain ranges of weight gain given a specific body mass index (BMI) result in more positive outcomes for both fetus and mother.1 Weight gain during pregnancy is attributed to the weight of the fetus, as well as a number of other factors, as shown in the table below.
Pregnancy Weight Gain Distribution2
|Enlarged breasts||1-3 pounds|
|Enlarged uterus||2 pounds|
|Amniotic fluid||2 pounds|
|Increased blood volume||3-4 pounds|
|Increased fluid volume||2-3 pounds|
|Fat stores||6-8 pounds|
The weight gain guidelines from the Institute of Medicine are shown in the table below, but note that these are only recommendations and that weight gain between women varies. As such, a health care provider should be consulted to more accurately determine each person's specific needs.
Recommendations for Total Weight Gain During Pregnancy by Prepregnancy BMI1
|Total Weight Gain Range
for Pregnancy with Twins
|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|
Generally, it is recommended that pregnant women gain only 1-4 pounds during the first 3 months of pregnancy, and 1 pound per week during the remainder of the pregnancy. It is possible to achieve this by consuming an additional ~300 calories per day.2
Potential Complications of Suboptimal Weight Gain
There are adverse effects for either insufficient or excessive weight gain during pregnancy. Insufficient weight gain can compromise the health of the fetus and cause preterm, or premature birth; excessive weight gain can cause labor complications, giving birth to significantly larger than average fetuses, postpartum weight retention, as well as increase the risk of requiring a caesarean section.
- Institute of Medicine. 2009. "Weight Gain During Pregnancy: Reexamining The Guidelines." http://www.nationalacademies.org/hmd/~/media/Files/Report%20Files/2009/Weight-Gain-During-Pregnancy-Reexamining-the-Guidelines/Report%20Brief%20-%20Weight%20Gain%20During%20Pregnancy.pdf.
- Mayo Clinic. 2017. "Pregnancy weight gain: What's healthy?" https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/in-depth/pregnancy-weight-gain/art-20044360?pg=1.