Pregnancy Weight Gain Tracker
Track your weight gain week by week and compare it to the IOM (Institute of Medicine) recommendations personalized to your pre-pregnancy BMI. All your data stays in your browser.
IOM Recommendations for Pregnancy Weight Gain
The Institute of Medicine (IOM, now the National Academy of Medicine) published pregnancy weight gain recommendations based on pre-pregnancy BMI. These guidelines are widely used by healthcare professionals worldwide to guide weight monitoring during pregnancy.
| BMI Category | BMI (kg/m²) | Recommended Weight Gain |
|---|---|---|
| Underweight | < 18.5 | 12.5 to 18 kg |
| Normal weight | 18.5 - 24.9 | 11.5 to 16 kg |
| Overweight | 25 - 29.9 | 7 to 11.5 kg |
| Obese | ≥ 30 | 5 to 9 kg |
These ranges are guidelines and should be adapted to each individual situation. Steady, gradual weight gain is generally more important than the exact number on the scale.
How to Calculate Your BMI
Body Mass Index (BMI) is an indicator that helps assess your body composition. It is calculated from your weight and height before pregnancy.
Your BMI should ideally be calculated using your pre-pregnancy weight (or very early pregnancy weight). This pre-conception BMI determines the recommended weight gain range according to the IOM.
When to Be Concerned About Weight Gain
It is perfectly normal for weight gain to vary from week to week. During the first trimester, weight gain is generally minimal (between 0 and 2 kg), and some women even lose weight due to nausea. It is during the second and third trimesters that weight gain accelerates.
Consult your healthcare provider if:
- Your weight gain is significantly above or below the recommended range
- You gain more than 1 kg per week in the second or third trimester
- You lose weight after the first trimester
- You have sudden swelling (hands, face, feet)
Every pregnancy is unique. Do not compare yourself to others and trust your medical team to adapt recommendations to your personal situation. The important thing is to maintain a balanced diet and appropriate physical activity, in line with advice from your doctor or midwife.