Health & Fitness

Pregnancy Weight Gain Calculator

Calculate your recommended weight gain range.

Based on your pre-pregnancy BMI, calculate the recommended total pregnancy weight gain range per IOM (Institute of Medicine) guidelines.

Enter a valid height.
Enter a valid weight.

Pre-Pregnancy BMI Category

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Recommended Total Weight Gain

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How to Use This Tool

  1. Enter your pre-pregnancy height and weight.
  2. Select whether you're carrying a single baby or twins.
  3. Click Calculate for your recommended weight gain range.

IOM Pregnancy Weight Gain Guidelines

The Institute of Medicine (IOM) recommends total pregnancy weight gain ranges based on pre-pregnancy BMI category:

Recommendations for twin pregnancies are higher across all categories to support the additional needs of carrying multiples.

Why Individual Needs Vary

These are general population guidelines — your obstetrician or midwife may recommend a different target based on your specific health history, nutritional needs, and how your pregnancy is progressing. Always follow your healthcare provider's personalized guidance over general guidelines.

Weight Gain Isn't Linear

Typical pregnancies involve modest weight gain in the first trimester (often just 1-5 lbs total) with more gradual, steady gain in the second and third trimesters — don't be alarmed if early gain is slower than a simple monthly average would suggest.

Frequently Asked Questions

Should I follow this calculator's recommendation over my doctor's advice?

No — always follow your healthcare provider's personalized guidance, which accounts for your specific health history and how your individual pregnancy is progressing, over any general online calculator.

Is weight gain supposed to be even throughout pregnancy?

No, it's typically not linear — many pregnancies involve slower weight gain in the first trimester and more consistent gain in the second and third trimesters, so don't worry if early gain seems slower than a simple average would suggest.

This calculator is provided for general informational and estimation purposes only. Results should not be treated as professional financial, tax, legal, medical, or engineering advice. Always verify critical calculations with a qualified professional or official source before making decisions.