Evidence-based guidelines from the Institute of Medicine for healthy pregnancy weight gain based on pre-pregnancy BMI.
Enter your pre-pregnancy weight and height to calculate your BMI and identify your recommended weight gain range.
| Category | Pre-Pregnancy BMI | Total Weight Gain | Weekly Rate (2nd & 3rd trimester) |
|---|---|---|---|
| Underweight | < 18.5 | 28 – 40 lbs | 1.0 – 1.3 lbs / week |
| Normal Weight | 18.5 – 24.9 | 25 – 35 lbs | 0.8 – 1.0 lbs / week |
| Overweight | 25.0 – 29.9 | 15 – 25 lbs | 0.5 – 0.7 lbs / week |
| Obese | ≥ 30 | 11 – 20 lbs | 0.4 – 0.6 lbs / week |
Twin pregnancies generally require approximately 10 additional pounds of weight gain compared to singleton pregnancies across all BMI categories. The following ranges reflect current recommendations:
These are general guidelines. Recommendations may be adjusted based on your individual health history, pregnancy complications, and provider guidance. Please discuss your personal weight gain goals at your prenatal visits.
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