Calculate prepregnancy body mass index (BMI) and view the corresponding total pregnancy weight-gain range published by the U.S. Centers for Disease Control and Prevention for a pregnancy with one baby.
Pregnancy Weight Gain Calculator
Calculate prepregnancy BMI and view the corresponding CDC/IOM total-gain range for a singleton pregnancy.
For singleton pregnancies, CDC guidance uses prepregnancy BMI to describe total pregnancy weight-gain ranges: underweight 28–40 lb, normal weight 25–35 lb, overweight 15–25 lb, and obesity 11–20 lb. Individual recommendations can differ, especially with twins, medical conditions, or clinician-specific guidance.
CDC weight-gain ranges for a singleton pregnancy
CDC guidance organizes total recommended gain by prepregnancy BMI. The published ranges are 28–40 lb for BMI below 18.5, 25–35 lb for BMI 18.5–24.9, 15–25 lb for BMI 25.0–29.9, and 11–20 lb for BMI 30 or higher.
Read the CDC pregnancy weight-gain guidance.
Why this is not a personalized target
BMI is a screening measure, not a complete description of health, nutrition, body composition, pregnancy risk, or fetal growth. Individual guidance can differ because of multiple gestation, nausea and vomiting, metabolic conditions, fetal-growth concerns, eating-disorder history, bariatric surgery, or other clinical factors. Your prenatal team can interpret weight changes in the context of the whole pregnancy.
What if you are pregnant with twins or more?
This calculator intentionally reports only the singleton ranges. CDC publishes separate guidance for twin pregnancies in several BMI categories, and pregnancies with triplets or more require individualized clinical guidance.
Use the trend, not one isolated number
Body weight fluctuates with hydration, clothing, time of day, and measurement conditions. In prenatal care, clinicians interpret trends alongside blood pressure, symptoms, laboratory information, fetal growth, and other findings rather than treating one scale reading as a diagnosis.
