Pregnancy Weight Gain Calculator
See a healthy total weight-gain range for your pregnancy, based on your starting BMI and the IOM guidelines.
Awaiting Data
Enter your details and tap Calculate to see your results appear here.
Your result appears here.
Healthy Weight Gain in Pregnancy
Gaining the right amount supports your baby's growth and your own recovery. The healthy range depends on your weight before pregnancy.
The Institute of Medicine sets ranges by pre-pregnancy BMI. A lower starting BMI calls for more gain, and a higher one for less.
This tool also estimates where you should be by your current week.
How to Use This Calculator
- Enter your height and pre-pregnancy weight.
- Add your current week and pregnancy type.
- Tap Calculate for your range.
The Guidelines Used
Normal (18.5 to 24.9): 11.5 to 16 kg
Overweight (25 to 29.9): 7 to 11.5 kg
Obese (30+): 5 to 9 kg
- BMI
- Your body mass index before pregnancy.
Understanding Your Results
Tips to Improve
- Focus on nutrient-rich foods, not just calories.
- Gain steadily rather than in spurts.
- Stay gently active with your provider's blessing.
- Discuss your target at prenatal visits.
Frequently Asked Questions
It depends on your pre-pregnancy BMI, from about 5 to 18 kilograms across the categories.
No. Twin pregnancies call for more total gain, which the tool reflects.
Talk with your provider, who can adjust guidance to your situation.
Scientific References
- Institute of Medicine. (2009). Weight Gain During Pregnancy: Reexamining the Guidelines. National Academies Press.
- Rasmussen, K. M., & Yaktine, A. L. (2009). Weight gain during pregnancy. National Academies Press.
- American College of Obstetricians and Gynecologists. (2020). Weight gain during pregnancy, Committee Opinion No. 548.