Pregnancy Weight Gain Calculator

The recommended amount depends on your pre-pregnancy BMI. Underweight women (BMI < 18.5) should gain 28–40 lbs, normal weight women (BMI 18.5–24.9) should gain 25–35 lbs, overweight women (BMI 25–29.9) should gain 15–25 lbs, and obese women (BMI ≥ 30) should gain 11–20 lbs for a single pregnancy. These are general guidelines — always consult your healthcare provider.

Yes, it is common to lose a small amount of weight in the first trimester due to morning sickness and nausea. Most total pregnancy weight gain is expected to occur during the second and third trimesters. Our calculator notes that weeks 1–13 typically involve minimal gain of 0–4.5 lbs (0–2 kg).

Absolutely. Women carrying twins have higher recommended weight gain targets. For a normal BMI, the range is 37–54 lbs for twins compared to 25–35 lbs for a single pregnancy. The calculator automatically adjusts all ranges when you select 'Twins' as your pregnancy type.

During the second and third trimesters, normal-weight women should aim for approximately 0.8–1.0 lbs (0.35–0.50 kg) per week. Underweight women may aim slightly higher at 1.0–1.3 lbs/week, while overweight women should target 0.5–0.7 lbs/week and obese women 0.4–0.6 lbs/week.

Yes. Enter your pre-pregnancy weight (not your current weight) for the BMI calculation, then enter your current weight and current pregnancy week in the optional fields. The calculator will estimate your expected weight gain for your current week and tell you whether you are on track, below, or above the recommended range.