Pregnancy Weight Gain Calculator

Recommended total weight gain for a single pregnancy depends on your starting BMI (IOM guidelines). Informational only.

How the Math Works

The Pregnancy Weight Gain Calculator uses the Institute of Medicine (IOM) guidelines, which link recommended weight gain to your pre-pregnancy body mass index (BMI). First, calculate BMI by dividing your weight in kilograms by your height in meters squared. Based on this BMI, the calculator determines your category: underweight (BMI <18.5), normal weight (18.5–24.9), overweight (25–29.9), or obese (≥30). The IOM provides weight gain ranges for each category during pregnancy, such as 25–35 pounds for normal weight individuals, ensuring safe and healthy outcomes.

Practical Applications

To use the calculator, input your pre-pregnancy weight and height to determine your BMI category. The tool then displays your recommended total weight gain range for the pregnancy. This helps healthcare providers tailor prenatal care, nutrition plans, and exercise recommendations to your specific needs, while also serving as a reference for monitoring progress during regular checkups.

Day-to-Day Use

By understanding your target weight gain, you can make informed daily choices about diet and physical activity, reducing anxiety about 'gaining the right amount.' It empowers you to track progress, communicate effectively with your doctor, and adjust habits to stay within guidelines while prioritizing your and your baby's health throughout pregnancy.

Worked example

BMI 22 (normal) → 11.5–16 kg.

FAQ