How much should I gain in first trimester?
1-4 lbs total in first trimester is typical. Most gain occurs in second and third trimesters.
Health Fitness
Pregnancy Weight Gain Calculator
Estimate pregnancy weight gain with quick inputs.
Fast, practical estimates
Adjust inputs for the most useful result.
What this calculator does
A pregnancy weight gain calculator provides healthy weight gain targets based on pre-pregnancy BMI. Recommendations vary: underweight women should gain more (28-40 lbs), normal weight 25-35 lbs, overweight 15-25 lbs, and obese 11-20 lbs.
How it works
Enter pre-pregnancy weight and height to calculate BMI. The calculator provides trimester-specific weight gain targets.
Formula
Total gain by BMI: Underweight: 28-40 lbs. Normal: 25-35 lbs. Overweight: 15-25 lbs. Obese: 11-20 lbs.
Tips for using this calculator
- Weight gain should be gradual, especially in first trimester
- Focus on nutrient-dense foods, not 'eating for two'
- Track gain at prenatal appointments
- Second/third trimesters: ~1 lb/week is typical
- Consult provider if gain is significantly above/below targets
Frequently asked questions
What if I'm gaining too much?
Discuss with provider. Focus on nutrient quality, portion control, and appropriate activity.
Is weight gain the same for twins?
No, twin pregnancies require more gain: 37-54 lbs (normal BMI), 31-50 lbs (overweight), 25-42 lbs (obese).