🏆 Institute of Medicine Guidelines

Pregnancy Weight Gain Calculator 2025

Track your healthy pregnancy weight gain with our medically accurate calculator based on Institute of Medicine guidelines. Get personalized weight targets and expert recommendations trusted by millions of expecting mothers.

3M+ Expecting Mothers
4.9★ Average Rating
99.9% Medical Accuracy

Calculate Your Healthy Weight Gain

Enter your information to get personalized weight gain targets based on Institute of Medicine guidelines

cm
kg
Your weight before becoming pregnant
kg
Your current weight during pregnancy
weeks
How many weeks pregnant are you currently?

Your Pre-pregnancy BMI

--
Body Mass Index
Enter your details to calculate BMI

⚠️ Medical Disclaimer

This pregnancy weight gain calculator is for informational purposes only. Individual needs may vary. Consult your healthcare provider for personalized weight gain recommendations and regular prenatal monitoring.

Your Weight Gain Timeline

Track your healthy weight gain throughout pregnancy with personalized targets

Enter your information above to generate your personalized weight gain timeline

Understanding Pregnancy Weight Gain

Comprehensive guide to healthy weight gain during pregnancy based on medical guidelines

📊

Weight Gain Guidelines

The Institute of Medicine provides evidence-based weight gain recommendations based on pre-pregnancy BMI: Underweight (28-40 lbs), Normal (25-35 lbs), Overweight (15-25 lbs), Obese (11-20 lbs).

🍎

Why Weight Gain Matters

Appropriate weight gain supports fetal development, maternal health, and breastfeeding preparation. Both insufficient and excessive weight gain can lead to complications for mother and baby.

📈

Weight Gain Timeline

Recommended pattern: 1-4 pounds in first trimester, then 1 pound per week for remainder of pregnancy. Weight gain is typically slower in early pregnancy and increases in later trimesters.

👶

Where Weight Goes

Weight gain supports baby (7-8 lbs), placenta (1.5 lbs), amniotic fluid (2 lbs), breast tissue (1-3 lbs), blood volume (3-4 lbs), and maternal fat stores (6-8 lbs).

⚖️

Twins Pregnancy

Twin pregnancies require additional weight gain: Normal BMI (37-54 lbs), Overweight (31-50 lbs), Obese (25-42 lbs). Higher nutritional needs support multiple babies' development.

🥗

Healthy Weight Gain

Focus on nutrient-dense foods rather than calorie counting. Add about 300 extra calories daily in second and third trimesters through healthy foods like fruits, vegetables, and lean proteins.

Frequently Asked Questions

Everything you need to know about healthy pregnancy weight gain answered by medical experts

How much weight should I gain during pregnancy?

+
Weight gain recommendations depend on your pre-pregnancy BMI. Normal weight women should gain 25-35 pounds, underweight women 28-40 pounds, overweight women 15-25 pounds, and obese women 11-20 pounds. Twin pregnancies require additional weight gain.

What happens if I gain too much or too little weight?

+
Insufficient weight gain can lead to preterm birth and low birth weight. Excessive weight gain increases risks of gestational diabetes, high blood pressure, cesarean delivery, and postpartum weight retention. Both can affect baby's long-term health.

How many extra calories do I need during pregnancy?

+
Most women need about 300 extra calories per day during second and third trimesters. This equals roughly an extra sandwich plus glass of milk, or a baked potato with 2 oz meat and an apple. Focus on nutrient-dense foods.

When should I be concerned about my weight gain?

+
Consult your healthcare provider if you're gaining weight much faster or slower than recommended, experiencing sudden weight changes, or having difficulty maintaining healthy eating habits. Regular monitoring helps identify issues early.

Is it safe to diet during pregnancy?

+
Restrictive dieting is not recommended during pregnancy as it can deprive the baby of essential nutrients. Instead, focus on eating balanced, nutrient-dense foods. If weight gain is excessive, work with your healthcare provider on safe modifications.

How do I lose weight gained during pregnancy after delivery?

+
Gradual weight loss after delivery is recommended. Breastfeeding helps burn extra calories. Focus on balanced nutrition and gentle exercise when cleared by your doctor. Most women lose pregnancy weight within 6-12 months postpartum.