Pregnancy Weight Gain Calculator

Choose your pre-pregnancy BMI category to see commonly cited total weight-gain guidance for a singleton pregnancy.

How the pregnancy weight gain calculator works

Common US guidance for singleton pregnancies varies by pre-pregnancy BMI: 28–40 lb underweight, 25–35 lb normal weight, 15–25 lb overweight and 11–20 lb obesity.

Formula and assumptions

Common US guidance for singleton pregnancies varies by pre-pregnancy BMI: 28–40 lb underweight, 25–35 lb normal weight, 15–25 lb overweight and 11–20 lb obesity.

Example

Try the sample values, then change one input at a time to see how the result changes. Check that units match the labels.

Important limitations

These are population-level guideline ranges, not a target for every pregnancy. Twin pregnancies and individual medical circumstances require different guidance; discuss weight gain with your prenatal clinician.

Frequently asked questions

What does this calculator do?

What does this calculator estimate? Choose your pre-pregnancy BMI category to see commonly cited total weight-gain guidance for a singleton pregnancy.

What should I know about the result?

These are population-level guideline ranges, not a target for every pregnancy. Twin pregnancies and individual medical circumstances require different guidance; discuss weight gain with your prenatal clinician.

Results are estimates for general information only. They are not a substitute for professional advice where applicable. Found a mistake? Report an error.