Pregnancy Weight Gain Calculator
Show CDC/National Academies reference weight-gain ranges based on pre-pregnancy BMI and singleton/twin pregnancy.
Enter or adjust the values above, then calculate.
Pregnancy Weight Gain: bMI-Based Reference Range
Show CDC/National Academies reference weight-gain ranges based on pre-pregnancy BMI and singleton/twin pregnancy.
Inputs this tool uses
- Pre-pregnancy weight
- Height
- Pregnancy
- Current weight (optional)
What you get
General total pregnancy weight-gain reference range by pre-pregnancy BMI and pregnancy type.
How to use the Pregnancy Weight Gain Calculator
- Enter pre-pregnancy weight, height, pregnancy and the other fields relevant to this calculation.
- Select any method, activity level or option shown on this page, then choose Calculate.
- Read the main result together with the supporting values, method, assumptions and limitations below before using the estimate.
How this calculation works
Pregnancy weight-gain ranges are tied to pre-pregnancy BMI and pregnancy type using current public-health reference ranges.
Example calculation
The sample values loaded into the calculator produce 11.5–16.0 kg. This example exists to show how the output is structured; replace the sample values with your own inputs for your calculation.
Assumptions and limitations
- Pregnancy dating is an estimate and clinical ultrasound may change the working due date.
- This tool is educational and does not replace prenatal care or medical advice.
Sources and review status
Source set last verified 2026-09-25. No clinician review is claimed unless a real named reviewer is displayed.
Questions people ask about Pregnancy Weight Gain Calculator
Is this pregnancy weight-gain range personalized medical advice?
No. It shows general public-health reference ranges based on pre-pregnancy BMI and pregnancy type. Prenatal care is the right place for individualized guidance.
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