Recommended total weight gain range for your pre-pregnancy BMI (IOM guidelines, singleton pregnancy).
A general guideline, not medical advice — twins/multiples and individual health conditions change these numbers. Follow your doctor's guidance.
It's based on your pre-pregnancy BMI (weight ÷ height²), using the four IOM (2009) categories: Underweight, Normal weight, Overweight and Obese. Each category has its own recommended total gain range for a singleton pregnancy.
The calculator assumes about 1.5 kg total gain in the first trimester (weeks 0–13), then spreads the rest of your category's range evenly across weeks 14–40. It's a simple linear model, not a clinical growth chart, so treat it as a ballpark, not a target to hit exactly.
No — these IOM ranges are for a singleton pregnancy. Twin and multiple pregnancies have higher recommended gain ranges, so talk to your doctor for guidance specific to your pregnancy.