🤰 Pregnancy Weight Gain Calculator

The 2009 guidelines from the US Institute of Medicine (IOM, now NAM) recommend the following total weight gain for singleton pregnancies by pre-pregnancy BMI: Underweight (BMI < 18.5): 12.5–18 kg (28–40 lb), Normal (18.5–24.9): 11.5–16 kg (25–35 lb), Overweight (25–29.9): 7–11.5 kg (15–25 lb), Obese (≥ 30): 5–9 kg (11–20 lb). The lower your pre-pregnancy weight, the more gain is recommended, and vice versa. These ranges are statistical recommendations derived from maternal and fetal health outcomes.

Gaining well below the recommended range is associated with a higher risk of low birth weight, while gaining well above it is associated with higher risks of gestational diabetes, hypertension, difficult delivery, and postpartum weight retention. The right target still depends on your individual health and how the pregnancy progresses — use this calculator only as a starting point and set goals with your doctor at regular prenatal visits.