Pregnancy Weight Gain Calculator

Calculate recommended pregnancy weight gain based on your pre-pregnancy BMI. Track progress by week with IOM guidelines and trimester targets for healthy pregnancy.

Pre-Pregnancy Weight (lbs)

Height (ft & in)

Current Week of Pregnancy (1-42)

Current Weight (lbs)

Number of Babies

IOM Weight Gain Recommendations

BMI Category	BMI Range	Singleton (lbs)	Twins (lbs)
Underweight	< 18.5	28-40	50-62
Normal	18.5 - 24.9	25-35	37-54
Overweight	25 - 29.9	15-25	31-50
Obese	>= 30	11-20	25-42

Enter your pre-pregnancy weight and height to see personalized weight gain recommendations based on IOM guidelines. Add your current week and weight to track your progress.

Disclaimer

This calculator provides estimates based on the Institute of Medicine (IOM) 2009 guidelines for gestational weight gain. Individual needs may vary significantly.

This is not medical advice. Weight gain during pregnancy is influenced by many factors including pre-existing conditions, maternal age, and individual health circumstances. Always work with your healthcare provider to determine the right weight gain goals for your pregnancy.

Triplet pregnancies use twin guidelines as IOM does not provide separate recommendations for higher-order multiples.

How to Use Pregnancy Weight Gain Calculator

1Enter your pre-pregnancy weight and height.
2Set your current week of pregnancy.
3Enter your current weight.
4View recommended range and progress.

Frequently Asked Questions

How much weight should I gain during pregnancy?▾

Recommended weight gain depends on pre-pregnancy BMI: Underweight (28-40 lbs), Normal weight (25-35 lbs), Overweight (15-25 lbs), Obese (11-20 lbs). Twin pregnancies require more.

When does most pregnancy weight gain occur?▾

Most weight gain occurs in the second and third trimesters (about 1 pound per week). First trimester gain is typically only 2-5 pounds total.

What if I gain too much or too little?▾

Excessive gain increases risk of gestational diabetes and large babies. Insufficient gain may lead to preterm birth or low birth weight. Talk to your healthcare provider.

About Pregnancy Weight Gain Calculator

Calculate recommended pregnancy weight gain based on your pre-pregnancy BMI. Track progress by week with IOM guidelines and trimester targets for healthy pregnancy.

NexTool's Pregnancy Weight Gain Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.