Using the Pregnancy Weight Gain Calculator
Enter weight from before pregnancy, rather than current pregnancy weight, and height in centimeters. These values determine the reference category. The output describes total gain across pregnancy; it does not say how much should have been gained by a particular date.
Worked example
Use the example inputs below to reproduce this result. These are the form's starting values, not recommended targets. Changing your inputs updates your result above; this worked example stays fixed for comparison. Results are rounded for display.
Example inputs
- Pre-pregnancy weight (kg)
- 60
- Height (cm)
- 165
Example result
- Pre-pregnancy BMI
- 22.038567
- Total gain reference (lb)
- 25 – 35
- Total gain reference (kg)
- 11.3 – 15.9
Method and assumptions
CDC reference ranges based on pre-pregnancy BMI for one baby. Individual goals and weight-gain timing should be discussed with a prenatal clinician.
Reference: cdc.gov — method and further reading
Keep total gain separate from progress at a given week
A total-pregnancy reference range does not specify a straight-line rate of gain or a target for every week. This form does not ask for gestational age and cannot evaluate progress at a particular appointment. Use the reference as background for a discussion with a prenatal clinician who can consider the pregnancy's individual circumstances.
Common question
Can I use the range for twins?
No. This calculator uses the linked CDC reference for a singleton pregnancy. A pregnancy with more than one baby needs a different reference and individual guidance. Entering a different weight does not adapt the model for twins.
Guide updated .