Pregnancy Weight Gain Calculator

Track recommended pregnancy weight gain based on pre-pregnancy BMI using Institute of Medicine guidelines. Healthy weight gain supports baby development and maternal health. Underweight women need to gain more to support fetal growth, while overweight women should gain less to reduce complications. Most weight gain occurs in the second and third trimesters at a rate of 0.4-0.5 kg per week for normal-weight women. The weight gained includes the baby (3-4 kg), placenta (0.7 kg), amniotic fluid (0.8 kg), increased blood volume (1.5 kg), breast tissue (0.5 kg), uterine growth (1 kg), fat stores (2-4 kg), and extra fluid (1.5 kg). Focus on nutrient-dense foods rather than "eating for two"—caloric needs only increase by about 340 calories in the second trimester and 450 in the third. Regular prenatal checkups will monitor your weight gain trajectory.