Weight Gain Calculator
See a healthy weight gain range for your body and your week.
Enter your height and pre-pregnancy weight to see your healthy range.
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How your healthy range is calculated
The calculator uses your pre-pregnancy BMI to find a recommended total weight-gain range, based on the widely used Institute of Medicine (now the National Academy of Medicine) guidelines. As you add weekly entries, it shows whether you're tracking within, below, or above the suggested range for that point in pregnancy.
Steady beats fast
After a small first-trimester gain, a gradual, steady climb is typical and healthy. The shaded band on the chart shows the recommended range week by week, so you can see the trend rather than fixate on any single number.
A guide, not a rule
These ranges are general guidelines for a single, healthy pregnancy. Your body, history, and starting point all shape what is right for you, so treat the band as a reference rather than a target to hit exactly.
Common questions
How much weight should I gain during pregnancy?
It depends on your pre-pregnancy BMI. General IOM and NAM guidance suggests 28 to 40 lb if underweight, 25 to 35 lb at a healthy weight, 15 to 25 lb if overweight, and 11 to 20 lb if obese.
Where does the weight actually go?
Only a portion is the baby. The rest includes the placenta, amniotic fluid, extra blood and fluids, a larger uterus and breasts, and some fat stores to support breastfeeding.
Is it normal to gain little in the first trimester?
Yes. Many people gain only a pound or two early on, and some lose a little with nausea. Most weight gain happens steadily through the second and third trimesters.
What if I'm carrying twins?
Recommended ranges are higher for twins, so this single-baby calculator will not apply to a multiple pregnancy.
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