Gestational Weight Gain Guidance
Enter your pre-pregnancy weight, current weight, height, and gestational week to compare progress against evidence-based recommendations.
Pre-pregnancy BMI
22.0
Normal weight (BMI 18.5–24.9)
Total gain to date
5.0 kg
Recommended range
6.9 – 7.5 kg
Average weekly gain (2nd/3rd trimester)
0.45 kg/week
Guideline: 0.35 – 0.50 kg/week
How to Use This Calculator
Measure heights and weights accurately
Use preconception or first prenatal visit weight as the baseline; measure height without shoes.
Update current weight regularly
Track changes at prenatal visits or weekly at home, ideally at the same time of day.
Discuss deviations with your provider
Individualized plans are essential for multiple gestation, pre-existing conditions, or high-risk pregnancies.
Formula
BMI = Pre-pregnancy weight (kg) ÷ (Height (m))²
Total weight gain = Current weight − Pre-pregnancy weight
Weekly gain (2nd/3rd trimester) ≈ Total gain ÷ (Gestational week − 13)
Guideline ranges from the Institute of Medicine (2009) for singleton pregnancies.
Full Description
Appropriate gestational weight gain supports fetal growth while minimizing maternal complications. The Institute of Medicine provides target ranges based on pre-pregnancy BMI. Under-gain can increase risk of small-for-gestational-age infants; over-gain raises risks for cesarean delivery, macrosomia, postpartum weight retention, and hypertensive disorders. Tailor recommendations for adolescents, short stature, multiple gestations, or pre-existing conditions with guidance from obstetric clinicians and dietitians.
Frequently Asked Questions
How does nausea or hyperemesis affect gain?
Severe first-trimester weight loss warrants medical attention. Nutritional support or antiemetics may be necessary.
Is weight gain different for twins?
Yes. Twin pregnancies require higher total gain; consult specific twin guidelines and your provider.
Can I exercise while managing weight?
Moderate exercise is encouraged for most pregnancies. Customize plans with provider approval, especially for high-risk conditions.
How often should I weigh myself?
Weekly checks are sufficient for most. Focus on trends rather than daily fluctuations.