Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on your pre-pregnancy BMI.
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Pregnancy Weight Gain Guidelines
Weight gain during pregnancy is normal and necessary for your baby's healthy development. The recommended amount depends on your pre-pregnancy BMI (Body Mass Index).
Our calculator uses guidelines from the Institute of Medicine (IOM) to determine appropriate weight gain based on your pre-pregnancy BMI category.
Weight Gain by BMI Category
Underweight (BMI < 18.5)
Recommended: 28-40 lbs (12.5-18 kg)
Normal Weight (BMI 18.5-24.9)
Recommended: 25-35 lbs (11.5-16 kg)
Overweight (BMI 25-29.9)
Recommended: 15-25 lbs (7-11.5 kg)
Obese (BMI ≥ 30)
Recommended: 11-20 lbs (5-9 kg)
Frequently Asked Questions
Q: How much weight should I gain each trimester?
A: First trimester: 1-5 lbs total. Second and third trimesters: approximately 1 lb per week. Weight gain is typically minimal in the first trimester and more consistent in later trimesters.
Q: What if I'm gaining too much or too little weight?
A: Consult with your healthcare provider. They can help you adjust your diet and exercise to stay within healthy weight gain ranges. Every pregnancy is different, and your provider can give personalized guidance.
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