Gestational Weight Gain Target by Pre-Pregnancy BMI (IOM)

Calculate recommended gestational weight gain using 2009 IOM guidelines based on pre-pregnancy BMI. Underweight (<18.5): 28-40 lb; normal weight (18.5-24.9): 25-35 lb; overweight (25-29.9): 15-25 lb; obese (≥30): 11-20 lb.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate recommended gestational weight gain using 2009 IOM guidelines based on pre-pregnancy BMI. Underweight (<18.5): 28-40 lb; normal weight (18.5-24.9): 25-35 lb; overweight (25-29.9): 15-25 lb; obese (≥30): 11-20 lb

Each component has a specific meaning:

  • 2009 IOM guidelines based on pre-pregnancy BMI — The 2009 iom guidelines based on pre-pregnancy bmi recorded for the scenario being assessed.

Note: Interpret the gestational weight gain iom result against the thresholds and context described above.

How to Use

Enter the 2009 IOM guidelines based on pre-pregnancy BMI for the scenario you are assessing. Calculate recommended gestational weight gain using 2009 IOM guidelines based on pre-pregnancy BMI. Underweight (<18.5): 28-40 lb; normal weight (18.5-24.9): 25-35 lb; overweight (25-29.9): 15-25 lb; obese (≥30): 11-20 lb. Use the gestational weight gain iom result to inform your calculation.

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Frequently Asked Questions