Pregnancy Weight Gain Tracker
Pregnancy Weight Gain Assessment
Track your pregnancy weight gain against IOM (Institute of Medicine) recommendations by trimester.
kg
kg
cm
weeks
Formula
IOM 2009 Guidelines - Total gain by pre-pregnancy BMI: Underweight: 12.5-18 kg, Normal: 11.5-16 kg, Overweight: 7-11.5 kg, Obese: 5-9 kg. Weekly rate (2nd/3rd trimester): 0.51 kg (underweight), 0.42 kg (normal), 0.28 kg (overweight), 0.22 kg (obese).
Frequently Asked Questions
How much weight should I gain during pregnancy?
The IOM recommends total weight gain based on pre-pregnancy BMI: Underweight (BMI < 18.5): 12.5-18 kg (28-40 lbs), Normal weight (BMI 18.5-24.9): 11.5-16 kg (25-35 lbs), Overweight (BMI 25-29.9): 7-11.5 kg (15-25 lbs), Obese (BMI >= 30): 5-9 kg (11-20 lbs).
When does most pregnancy weight gain occur?
Most weight gain occurs in the second and third trimesters. During the first trimester, typical gain is only 0.5-2 kg (1-4.5 lbs). During the second and third trimesters, gain is more steady, typically 0.2-0.5 kg (0.5-1 lb) per week depending on pre-pregnancy BMI.
What happens if I gain too much or too little weight?
Excessive weight gain increases the risk of gestational diabetes, preeclampsia, cesarean delivery, and postpartum weight retention. Insufficient weight gain increases the risk of preterm birth, low birth weight, and failure to initiate breastfeeding. Both extremes can affect the baby's long-term health.