Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on your pre-pregnancy BMI
Measurement System
Pre-pregnancy Information
kg
cm
Pregnancy Information
weeks
kg
Your Pregnancy Weight Gain Results
Based on Institute of Medicine guidelines
7.5 kg
Recommended Total Gain: 11.5-16 kg
Based on your pre-pregnancy BMI: Normal Weight
You are on track with your weight gain
Weekly Weight Gain Timeline
| Pre-pregnancy BMI | BMI Category | Recommended Total Gain | Weekly Gain (2nd & 3rd trimesters) |
|---|---|---|---|
| < 18.5 | Underweight | 12.5-18 kg (28-40 lbs) |
0.51 kg/week (1 lb/week) |
| 18.5-24.9 | Normal Weight | 11.5-16 kg (25-35 lbs) |
0.42 kg/week (1 lb/week) |
| 25-29.9 | Overweight | 7-11.5 kg (15-25 lbs) |
0.28 kg/week (0.6 lb/week) |
| ≥ 30 | Obese | 5-9 kg (11-20 lbs) |
0.22 kg/week (0.5 lb/week) |
About Pregnancy Weight Gain
Weight gain during pregnancy is essential for the health of both mother and baby. The recommended amount depends on your pre-pregnancy Body Mass Index (BMI). These guidelines are based on recommendations from the Institute of Medicine (IOM).
Weight Distribution During Pregnancy
Pregnancy weight isn't just fat - it's distributed across various components essential for your baby's development:
- Baby: About 3-4 kg at term
- Placenta: 0.7-1 kg
- Amniotic fluid: 1 kg
- Uterus growth: 1 kg
- Breast tissue: 0.5-1.5 kg
- Blood volume: 1.5-2 kg
- Fluids: 1.5-2 kg
- Maternal fat stores: 2.5-4 kg
Important Notes
- These are general guidelines - individual needs may vary
- Weight gain is typically minimal in the first trimester (1-2 kg)
- Most weight gain occurs in the second and third trimesters
- Always consult with your healthcare provider about your specific weight gain goals
- Multiple pregnancies (twins, triplets) require different weight gain recommendations