Track your weight progress during pregnancy week-by-week, and compare it against standard medical guidelines to ensure healthy outcomes for both you and your baby.
Gaining the clinically recommended amount of weight during pregnancy is one of the most critical factors in determining the health of your baby at birth. The extra pounds you gain are not just maternal fat—they represent the actual weight of the growing baby, the placenta, amniotic fluid, expanded blood volume, and enlarged breast tissue. However, gaining too much or too little weight carries severe medical risks for both mother and child, including gestational diabetes, preterm birth, and surgical delivery complications. Our clinical Pregnancy Weight Gain Calculator utilizes the official Institute of Medicine (IOM) guidelines to construct a personalized week-by-week weight tracking chart, perfectly tailored to your pre-pregnancy Body Mass Index (BMI).
Please fill in your pre-pregnancy weight, height, current weight, and gestational weeks to track weight targets.
Calculating your healthy weight gain curve requires establishing your pre-pregnancy baseline. Follow these steps:
Your results place you into an Institute of Medicine (IOM) target bracket. Women who are underweight prior to pregnancy need to gain more weight to support fetal growth, whereas women who are obese are prescribed a tightly restricted weight gain target. Here are the clinical guidelines for a singleton pregnancy:
| Pre-Pregnancy BMI Category | BMI Range | Singleton Pregnancy Target | Twin Pregnancy Target |
|---|---|---|---|
| Underweight | < 18.5 | 12.5 – 18.0 kg | 17.0 – 25.0 kg |
| Normal Weight | 18.5 – 24.9 | 11.5 – 16.0 kg | 17.0 – 25.0 kg |
| Overweight | 25.0 – 29.9 | 7.0 – 11.5 kg | 14.0 – 23.0 kg |
| Obese | ≥ 30.0 | 5.0 – 9.0 kg | 11.0 – 19.0 kg |
If you are consistently over-gaining weight, you significantly increase your risk of Gestational Diabetes, hypertensive disorders (preeclampsia), and delivering a macrosomic (excessively large) baby, which often forces an emergency C-section. Conversely, severe under-gaining can result in preterm labor and a low birth-weight infant with developmental delays.
Most importantly, if you experience sudden, rapid weight gain (more than 1-2 kg in a single week), especially in the third trimester, seek immediate medical attention—this is often swelling (edema) linked to severe preeclampsia. At Prakash Hospital, our Obstetrics and Clinical Nutrition teams collaborate to manage high-risk pregnancies, ensuring your diet safely nourishes your baby without causing maternal complications.
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