Pregnancy BMI Calculator
Calculate your Body Mass Index during pregnancy with our specialized calculator. Get personalized recommendations for healthy weight gain based on your pre-pregnancy BMI and current pregnancy week.
Step 1: Personal Information
Why Pre-Pregnancy Weight Matters
Your pre-pregnancy BMI determines the recommended weight gain range during pregnancy. This helps ensure optimal health for both mother and baby.
Step 2: Pregnancy Details
About Pregnancy Weight Gain
Healthy weight gain during pregnancy varies based on your pre-pregnancy BMI. The Institute of Medicine provides specific guidelines for different BMI categories.
Pregnancy BMI Results
Your Pregnancy BMI
Personalized Recommendations
Based on your Normal Weight BMI category:
For a singleton pregnancy, the recommended total weight gain is 11.5-16.0 kg (25-35 lbs).
Weekly Weight Gain (Second & Third Trimester):
Nutritional Recommendations:
- Increase calorie intake by approximately 340-450 calories per day in the second and third trimesters
- Focus on nutrient-dense foods: fruits, vegetables, whole grains, lean proteins
- Ensure adequate intake of folic acid, iron, calcium, and vitamin D
- Stay hydrated with at least 8-10 glasses of water daily
Exercise Guidelines:
- 30 minutes of moderate exercise most days of the week
- Safe activities: walking, swimming, prenatal yoga, stationary cycling
- Consult your healthcare provider before starting any new exercise regimen
BMI Categories & Weight Gain Guidelines
| BMI Category | BMI Range | Recommended Total Gain (Singleton) | Rate of Gain (2nd & 3rd Trimester) |
|---|---|---|---|
| Underweight | < 18.5 | 12.5-18.0 kg | 0.5-0.6 kg/week |
| Normal Weight | 18.5-24.9 | 11.5-16.0 kg | 0.4-0.5 kg/week |
| Overweight | 25.0-29.9 | 7.0-11.5 kg | 0.2-0.3 kg/week |
| Obese | ≥ 30.0 | 5.0-9.0 kg | 0.2-0.3 kg/week |
BMI Calculation Formula
BMI = Weight (kg) / [Height (m)]²
To calculate BMI: Divide your weight in kilograms by your height in meters squared. For pregnancy BMI, we use pre-pregnancy weight to determine your category.
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