Pregnancy Weight Gain Calculator
Check your pre-pregnancy BMI category, see the recommended total gain range, and compare your actual weight gain with week-by-week guidance for a single baby or twins.
Pre-pregnancy BMI
25.0
Normal
Recommended Total Gain
25 to 35 lb
IOM guideline range
Recommended So Far
10.8 to 16.9 lb
By week 24
Actual Gain So Far
18.0 lb
Over
Week-by-week tracking
Compare your progress with the recommended range at key milestones.
Actual gain shown by the vertical marker: 18.0 lb.
Actual gain shown by the vertical marker: 18.0 lb.
Your actual marker appears once you reach week 28.
Your actual marker appears once you reach week 36.
Your actual marker appears once you reach week 40.
Consult your healthcare provider.
How to Use
- Enter your pre-pregnancy weight and your current weight in pounds or kilograms.
- Add your height so the calculator can estimate your pre-pregnancy BMI category.
- Choose your current pregnancy week and turn on the twins option if needed.
- Review your recommended total gain, suggested gain so far, and whether you are currently under, on track, or over the guideline range.
Frequently Asked Questions
How is recommended pregnancy weight gain determined?
The calculator uses Institute of Medicine guideline ranges based on your pre-pregnancy BMI category. Lower BMI categories generally have higher recommended weight gain ranges, while higher BMI categories have lower ranges.
Why does the calculator ask for height?
Your height is used with your pre-pregnancy weight to estimate your pre-pregnancy BMI. That BMI category helps determine the recommended total pregnancy weight gain range.
Are twin pregnancy recommendations different?
Yes. Twin pregnancies usually have higher recommended weight gain ranges than singleton pregnancies. This calculator applies a separate set of higher ranges when the twins option is enabled.
What if my weight gain is outside the recommended range?
A result outside the guideline range does not automatically mean something is wrong, but it is a good reason to check in with your healthcare provider. Individual needs can vary based on your medical history, symptoms, and pregnancy progress.