Pregnancy Weight Gain Calculator
Enter valid height and weight.
Based on the US Institute of Medicine (IOM) 2009 guidelines, which set recommended total weight gain ranges by pre-pregnancy BMI category. These are population-level guidelines — your provider may recommend something different based on your specific health, whether you're carrying twins, and other individual factors.
Free pregnancy weight gain calculator using the US Institute of Medicine's 2009 guidelines — your recommended total weight gain range based on your pre-pregnancy BMI category.
How it works
- Enter your height and pre-pregnancy weight
- See your pre-pregnancy BMI category
- See the IOM-recommended total weight gain range for that category
Frequently asked questions
Why does the range depend on pre-pregnancy BMI?
The IOM guidelines set different recommended ranges for underweight, normal weight, overweight, and obese categories, since starting body composition affects healthy weight gain during pregnancy.
What if I'm carrying twins or have other health factors?
These guidelines are for a single pregnancy. Multiples, certain health conditions, and individual circumstances can change the recommended range — always follow your own healthcare provider's specific guidance over this general reference.
Related tools
From the blog
Update history
- 2026-09-03 Bounded numeric fields are now sliders instead of number inputs.
- 2026-09-01 Added: a cover image — used as the card thumbnail, social share image, and blog title image.
- 2026-09-01 Launched: pregnancy weight gain calculator using IOM 2009 BMI-based guidelines. Entirely client-side.