Pregnancy Weight Gain Calculator
This tool helps you track your pregnancy weight gain based on the official guidelines from the Institute of Medicine (IOM) to support a healthy pregnancy.
Your Healthy Weight Gain Recommendations
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Understanding Healthy Pregnancy Weight Gain
Gaining a healthy amount of weight during pregnancy is crucial for both your health and the development of your baby. It helps ensure your baby is a healthy size, reduces the risk of complications during labor, and makes it easier to return to your pre-pregnancy weight after delivery. The recommended weight gain depends primarily on your pre-pregnancy Body Mass Index (BMI).
Institute of Medicine (IOM) Guidelines
The recommendations provided by this calculator are based on the guidelines from the Institute of Medicine, which are followed by most healthcare professionals. First, find your pre-pregnancy BMI using our BMI Calculator, then see the recommendations below.
| Pre-Pregnancy BMI Category | Recommended Total Gain (Singleton) | Recommended Total Gain (Twins) |
|---|---|---|
| Underweight (<18.5) | 28 - 40 lbs | 50 - 62 lbs |
| Normal Weight (18.5 - 24.9) | 25 - 35 lbs | 37 - 54 lbs |
| Overweight (25.0 - 29.9) | 15 - 25 lbs | 31 - 50 lbs |
| Obese (≥30.0) | 11 - 20 lbs | 25 - 42 lbs |
Where Does the Weight Go?
It can be surprising to see the numbers, but the weight gain is distributed throughout your body and supports the baby's environment. At the end of a full-term pregnancy, the weight is roughly broken down as follows:
- Baby: 7-8 lbs
- Placenta: 1-2 lbs
- Amniotic Fluid: 2 lbs
- Larger Uterus: 2 lbs
- Increased Breast Tissue: 1-3 lbs
- Increased Blood Volume: 3-4 lbs
- Increased Body Fluids: 3-4 lbs
- Maternal Fat Stores: 6-8 lbs
Remember, a steady rate of gain is more important than the exact number on the scale each week. To support this gradual gain, focus on a balanced diet. You can learn more about general dietary needs with our Calorie Calculator, but always follow your doctor's specific nutritional advice during pregnancy.
Important Medical Disclaimer: This calculator provides guidance based on population averages and is for informational purposes only. It is not a substitute for professional medical care. Every pregnancy is unique. Please consult with your doctor or midwife about your personal weight gain goals.