Health & Fitness Calculators
Pregnancy Weight Gain Calculator
See the recommended pregnancy weight gain.
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Result
Recommended gain by week 20
13–18 lb
Total target: 25–35 lb
About the Pregnancy Weight Gain Calculator
Healthy weight gain during pregnancy depends on your pre-pregnancy BMI. Enter your starting BMI and current week and the calculator shows the recommended gain so far and the total target range, using the Institute of Medicine guidelines. It's a helpful check-in — your doctor's guidance for your specific pregnancy always comes first.
How to use the Pregnancy Weight Gain Calculator
- 1Enter your pre-pregnancy BMI and current week.
- 2Read the result instantly — it recalculates as you type.
- 3Adjust the numbers to model different scenarios.
Frequently asked questions
How much weight should I gain in pregnancy?
Guidelines suggest 25–35 lb for a normal pre-pregnancy BMI, more if underweight and less if overweight. This tool shows your range.
Is weight gain steady?
Most gain happens after the first trimester. Early on, only a few pounds are typical. Always follow your provider's advice.