Pregnancy Weight Gain Calculator

Compare your pre-pregnancy BMI and current weight gain with full-pregnancy weight-gain ranges for singleton or twin pregnancy.

Pregnancy weight goals require individualized prenatal care. This tool reports published total pregnancy ranges and does not determine whether your current week-by-week gain is medically appropriate.

Maintained by Live Fitness Check. Last updated: August 13, 2026. How we test our calculators .

About This Calculator

The Pregnancy Weight Gain Calculator uses pre-pregnancy height and weight to calculate BMI, then displays the published total pregnancy weight-gain range for the relevant BMI category and for either a singleton or twin pregnancy. It also shows how much weight has changed from the pre-pregnancy value.

Methodology

Pre-pregnancy BMI is weight in kilograms divided by height in meters squared. BMI categories are then mapped to CDC-published Institute of Medicine total pregnancy weight-gain ranges. The calculator reports the range for the full pregnancy; it does not create or judge a personalized week-by-week target.

Sources

CDC — Weight Gain During Pregnancy: https://www.cdc.gov/maternal-infant-health/pregnancy-weight/index.html
ACOG — Weight Gain During Pregnancy: https://www.acog.org/clinical/clinical-guidance/committee-opinion/articles/2013/01/weight-gain-during-pregnancy

Disclaimer

Pregnancy weight management requires prenatal care and individualized clinical judgment. This calculator only displays population guideline ranges for total pregnancy gain and cannot assess fetal growth, fluid changes, complications or whether your current gain is appropriate for your gestational week.

Frequently Asked Questions

What determines the recommended pregnancy weight-gain range?

Published recommendations use pre-pregnancy BMI and whether the pregnancy is singleton or twin.

Does this calculator say whether I am on track this week?

No. It reports the recommended total range for the entire pregnancy and your current change from pre-pregnancy weight.

What if I am carrying triplets or more?

The calculator does not support higher-order multiple pregnancy. Discuss an individualized weight-gain plan with your prenatal care team.

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