Pregnancy Weight Gain Calculator
Enter pre-pregnancy BMI, current weight, and weeks pregnant to check if your weight gain is on track.
The Institute of Medicine (IOM) recommends different total weight gain ranges for pregnancy based on pre-pregnancy BMI. This calculator shows your total recommended gain, whether your current gain is on track, and a healthy weekly rate for the second and third trimesters.
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Last reviewed: April 2026Report an error
Use our BMI Calculator to find yours
Weight Status
Over
Gained: 13.0 lbs at 20 weeks. Recommended at this point: 7.6–10.0 lbs. Total recommended (IOM): 25–35 lbs.
Weight Gained
13.0 lbs
Expected at 20 Wks
7.6–10.0 lbs
Status
Over
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How to Use This Pregnancy Weight Calculator
- Enter your pre-pregnancy BMI (or calculate it with our BMI Calculator).
- Enter your pre-pregnancy weight and current weight.
- Enter your current week of pregnancy.
- Read recommended total gain, whether you're on track, and weekly rate.
Frequently Asked Questions
- IOM guidelines by pre-pregnancy BMI: Underweight (<18.5): 28–40 lbs. Normal (18.5–24.9): 25–35 lbs. Overweight (25–29.9): 15–25 lbs. Obese (≥30): 11–20 lbs.
- Most women gain 1–4 lbs in the first trimester, then about 1 lb per week in the second and third trimesters. Morning sickness can cause weight loss early on.
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