Pregnancy Weight Gain Calculator

Ranges are the 2009 Institute of Medicine (IOM) recommendations for a single baby, by pre-pregnancy BMI: underweight (BMI below 18.5) 12.5–18 kg, normal 11.5–16 kg, overweight (25.0–29.9) 7–11.5 kg, obese (30 or more) 5–9 kg, with a weekly rate in the second and third trimesters of 0.44–0.58, 0.35–0.50, 0.23–0.33 and 0.17–0.27 kg. They use standard BMI cut-offs. Sources (kg table: PMC3247649 Table 1): IOM table (Obstet Gynecol), CDC. Twins and other multiples have different ranges. General reference ranges for a single pregnancy, not medical advice for you. Your own doctor's advice comes first.