How is recommended pregnancy weight gain calculated from pre-pregnancy BMI?
Weight gained = current weight − pre-pregnancy weight. The result is compared with CDC total-pregnancy ranges selected by pre-pregnancy BMI and singleton or twin pregnancy.
Health & fitness
Pregnancy weight gain calculator
Compare current pregnancy weight gain with CDC total ranges by pre-pregnancy BMI and singleton or twin pregnancy.
- Metric and imperial units
- Instant updates as inputs change
- Data is calculated in this browser only
Results update as you type
Weight gained so far18 lb
U.S. reference- Recommended total range
- 25–35 lb
- Remaining to the recommended range
- 7–17 lb
- Pre-pregnancy BMI
- 20.7 · Healthy weight range
- Current gestational week
- 24 weeks
This is the CDC range for the full pregnancy. Discuss your personal pace with your prenatal care professional.
Calculation notes
Understand the Pregnancy weight gain calculator
Selects the CDC total pregnancy weight-gain range from pre-pregnancy BMI, then compares it with current gain. Gestational week is context only; no week-by-week clinical target is inferred.
Is an 18 lb pregnancy weight gain within the CDC range?
A person who started at 132 lb and is now 150 lb has gained 18 lb. With a healthy pre-pregnancy BMI and a singleton pregnancy, the CDC total range is 25–35 lb.
How should I interpret total weight gain earlier in pregnancy?
- The comparison is with the full-pregnancy range, not a week-specific target.
- A value below the total range may still be expected earlier in pregnancy.
Does this calculator give a week-by-week pregnancy weight target?
- The calculator does not model trimester-specific gain or clinician-set targets.
- Multiple pregnancy beyond twins and high-risk conditions need individualized guidance.
Content and calculation reviewed: