Pregnancy Weight Gain Calculator
Pre-Pregnancy Measurements
Pregnancy Progress
Current Progress (Optional)
How It Works
- Pre-pregnancy BMI: Calculated from weight and height or entered directly
- IOM/CDC Guidelines: Recommended total gain ranges based on BMI category
- Weekly Plan: First trimester shows minimal gain; 2nd/3rd trimester shows weekly rates
- Progress Tracking: Compare actual gain to recommended range and see required pace
Overview
Use the Pregnancy Weight Gain Calculator to estimate how much weight you should aim to gain during pregnancy based on your pre-pregnancy BMI, following IOM/CDC guidelines. Enter your pre-pregnancy weight and height (or BMI), then provide your LMP or current gestational age and current weight to see a personalized total gain range, weekly targets, and how your current progress compares with recommended ranges.
About
About Pregnancy Weight Gain Calculator
Calculate recommended pregnancy weight gain based on pre-pregnancy BMI using IOM/CDC guidelines.
Features:
- IOM/CDC recommended ranges
- Pre-pregnancy BMI calculation
- Week-by-week plan
- Progress tracking
- Pace recommendations
- Cumulative chart
- Export to CSV
- 100% private
FAQ
What are the IOM weight gain recommendations?
They depend on pre-pregnancy BMI: Underweight 28–40 lb, Normal 25–35 lb, Overweight 15–25 lb, Obese 11–20 lb.
When is weight gain measured?
Gestational age is typically measured from LMP; this tool uses LMP or weeks entered manually.
What if I'm gaining too much or too little?
Discuss with your healthcare provider; they may screen for GDM or nutritional issues.
Does this apply to twins?
No — twin pregnancies have different IOM guidance. Consult your provider.
Is my data private?
Yes. All calculations happen in your browser. No data is stored or transmitted.