Pregnancy Weight Gain Calculator

The Pregnancy Weight Gain Calculator helps estimate a healthy weight gain schedule during pregnancy based on guidelines from the Institute of Medicine.

Adjust the values below to calculate your recommended weight gain goals.

Input Details:

Measurement Units:



1. Current Pregnancy Stage:


Are you pregnant with twins?



2. Height:



3. Weight Before Pregnancy:


4. Current Weight:


Recommended Weight Gain During Pregnancy

Pregnancy involves natural and necessary weight gain to support fetal development and prepare for breastfeeding. The Institute of Medicine provides guidelines based on pre-pregnancy Body Mass Index (BMI):

  • Underweight (BMI < 18.5): 28–40 lbs
  • Normal Weight (BMI 18.5–24.9): 25–35 lbs
  • Overweight (BMI 25–29.9): 15–25 lbs
  • Obese (BMI > 30): 11–20 lbs

For pregnancies with twins, the recommendations differ.

Understanding Weight Gain Distribution

Pregnancy weight gain is not just the baby’s weight but includes other critical components like:

  • Enlarged breasts: 1–3 lbs
  • Placenta: 1.5 lbs
  • Increased blood volume: 3–4 lbs
  • Fat stores: 6–8 lbs

Tips for Healthy Pregnancy Weight Gain

  1. Nutrition:
    • Focus on nutrient-dense foods like leafy greens, lean proteins, and healthy fats.
    • Include essential nutrients like folate, calcium, and iron.
  2. Exercise:
    • Regular, moderate physical activity is often safe and beneficial during pregnancy.
  3. Consultation:
    • Speak with a healthcare provider for personalized recommendations.

Note: Every pregnancy is unique. Always consult a medical professional for guidance tailored to your needs.

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