Pregnancy Weight Gain Calculator
Pregnancy Weight Gain Calculator
Track your weight gain against ACOG guidelines based on pre-pregnancy BMI.
Weight gain at week 20 — Above expected
Your gain so far
15.0 lbs
Expected by now
7.6 – 13.4 lbs
| Metric | Value |
|---|---|
| Pre-pregnancy BMI | 23.3 |
| Total recommended gain by week 40 | 25 – 35 lbs |
Expected Gain Trajectory
ACOG-expected cumulative gain band at each week for your BMI range.
ACOG guidelines
Normal-BMI women (18.5–24.9) should gain 25–35 lbs total — about 1–4 lbs in the first trimester, then roughly 1 lb/week. Overweight (BMI 25–29.9) targets 15–25 lbs; obese, 11–20 lbs. Gaining too little risks low birth weight; too much raises the odds of gestational diabetes and delivery complications.