Pregnancy Weight Gain Calculator

IOM Recommended Pregnancy Weight Gain by BMI

• Underweight (BMI <18.5): 28–40 lbs (12.5–18 kg)
• Normal weight (BMI 18.5–24.9): 25–35 lbs (11.5–16 kg)
• Overweight (BMI 25–29.9): 15–25 lbs (7–11.5 kg)
• Obese (BMI ≥30): 11–20 lbs (5–9 kg)

Where Does Pregnancy Weight Go?

For a typical 30 lb gain: Baby ~7.5 lbs | Placenta ~1.5 lbs | Amniotic fluid ~2 lbs | Uterus growth ~2 lbs | Breast tissue ~2 lbs | Blood volume ~4 lbs | Fluid retention ~4 lbs | Fat stores ~7 lbs

Healthy Weight Gain Tips

• Focus on nutrient-dense foods — not "eating for two"
• You need only ~300 extra calories/day in 2nd trimester, ~450 in 3rd
• Stay active with pregnancy-safe exercise (walking, swimming, prenatal yoga)
• Most weight gain occurs in 2nd and 3rd trimesters