👶 Maternal Health & Gestational Tracking
Pregnancy Weight Gain Calculator
Track recommended healthy pregnancy weight ranges week-by-week based on pre-pregnancy BMI according to official Institute of Medicine (IOM) clinical guidelines.
Pre-Pregnancy Baseline
Target Weight Range (Week 24)
66.5 - 69.2 kg
Pre-Pregnancy BMI
22.8 kg/m²
Normal Weight
Total 40-Wk Target
11.5 - 16.0 kg
25 - 35 lbs
Weekly Rate (2nd/3rd)
0.42 kg / wk
~0.9 lbs / wk
💡 IOM Clinical Guidance:
Weight gain during the 1st trimester is minimal (0.5 - 2.0 kg total). Steady weight gain begins in trimester 2 and 3 as the placenta, amniotic fluid, and fetal tissues grow.
Where Does Pregnancy Weight Go?
A healthy 30 lb (13.6 kg) maternal weight gain is distributed across vital biological structures:
- Baby: 7.5 lbs (3.4 kg)
- Placenta & Amniotic Fluid: 3.5 lbs (1.6 kg)
- Increased Blood & Fluid Volume: 8.0 lbs (3.6 kg)
- Uterus & Breast Tissue: 4.0 lbs (1.8 kg)
- Maternal Fat & Nutrient Reserves: 7.0 lbs (3.2 kg)