Pregnancy Weight Gain Calculator
Look up the CDC/IOM total pregnancy weight-gain range for one baby from pre-pregnancy adult BMI.
Formula
Pre-pregnancy BMI <18.5: 28–40 lb; 18.5–<25: 25–35; 25–<30: 15–25; ≥30: 11–20. kg = lb×0.45359237.
Lower total gain ≈ 25×0.45359237 · Upper total gain ≈ 35×0.45359237
How to use
- Use your BMI before pregnancy.
- Enter that BMI, not current pregnancy BMI.
- Discuss the total range with your maternity clinician.
Examples
- BMI 22: 25–35 lb, approximately 11.3–15.9 kg total.
Frequently asked questions
Is this a weekly target?
No. It is a total range for a singleton pregnancy, not a week-by-week growth assessment.
What about twins or individual complications?
The table does not apply to twins or multiple pregnancy. Your clinician may set a different individual goal.
Does this replace medical advice?
For information only; it does not replace a doctor or individual assessment.
Sources
Updated: