Pregnancy Weight Gain Calculator
Calculate recommended pregnancy weight gain based on your pre-pregnancy BMI. Track your weight gain throughout pregnancy using IOM guidelines.
Weight Gain Status
Current Gain
10.0 lbs
Within recommended range
Pregnancy Details
Measurements
Weight Gain Progress
Your Gain
10.0 lbs
Expected
9.0 lbs
Total Goal
25-35
Weight Gain Projection
Shaded area shows recommended weight range throughout pregnancy
IOM Weight Gain Guidelines
| Pre-pregnancy BMI | Total Gain (lbs) | Weekly Rate (2nd/3rd) |
|---|---|---|
| Underweight (<18.5) | 28-40 lbs | 1.0-1.3 lbs |
| Normal (18.5-24.9) | 25-35 lbs | 0.8-1.0 lbs |
| Overweight (25-29.9) | 15-25 lbs | 0.5-0.7 lbs |
| Obese (30+) | 11-20 lbs | 0.4-0.6 lbs |
Where Does Pregnancy Weight Go?
Baby
7-8 lbs
Placenta
1-2 lbs
Amniotic Fluid
2 lbs
Uterus
2 lbs
Breast Tissue
2 lbs
Blood Volume
4 lbs
Body Fluids
4 lbs
Fat Stores
5-9 lbs
Quick Answer
Recommended pregnancy weight gain depends on pre-pregnancy BMI. Normal BMI: gain 25-35 lbs. Underweight: 28-40 lbs. Overweight: 15-25 lbs. Obese: 11-20 lbs. Most gain occurs in 2nd and 3rd trimesters.
Key Facts
- Weight gain based on pre-pregnancy BMI
- Normal BMI: gain 25-35 lbs total
- Little gain in first trimester (1-4 lbs)
- About 1 lb/week in 2nd and 3rd trimesters
- Twins: add 10-15 lbs to recommendations
- Excessive gain increases complications
Frequently Asked Questions
Weight gain depends on your pre-pregnancy 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. Twin pregnancies require more weight gain.
Most women gain little weight in the first trimester (0-4 lbs). Weight gain picks up in the second trimester with about 1 lb per week. Some women may lose weight early due to morning sickness, which is usually not concerning.
Excess weight gain increases risk of gestational diabetes, high blood pressure, larger baby (making delivery harder), and difficulty losing weight postpartum. It doesn't harm the baby directly but can complicate pregnancy and delivery.
Insufficient weight gain may increase risk of preterm birth and low birth weight baby. Talk to your healthcare provider about calorie-dense, nutritious foods. Some women need help managing nausea to eat adequately.
Baby: 7-8 lbs. Placenta: 1.5 lbs. Amniotic fluid: 2 lbs. Uterus growth: 2 lbs. Breast tissue: 2 lbs. Blood volume: 4 lbs. Body fluids: 4 lbs. Fat stores: 5-9 lbs (for breastfeeding and energy).
Weight Gain Status
Current Gain
10.0 lbs
Within recommended range
Medical Disclaimer
This calculator is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider before making any health-related decisions.