Pregnancy Weight Gain Calculator by Trimester

Many people gain only a few pounds in the first trimester, then roughly 1 pound per week in the second and third trimesters if they started at a normal BMI — but targets vary by starting BMI and individual health. Your clinician may adjust goals for multiples, diabetes, or other conditions.

No. Guidelines from bodies such as the IOM are grouped by pre-pregnancy BMI (underweight, normal, overweight, obese). Twins or higher-order multiples have higher recommended ranges. Medical issues like hypertension may change the plan.

No. It helps you estimate timing and context from your LMP-based dates. Only your healthcare team can interpret your weight, nutrition, and pregnancy risks and set an appropriate target.