Pregnancy Weight Gain Calculator
Healthy weight-gain range by pre-pregnancy BMI
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Pregnancy Weight Gain Calculator
How much weight to gain in pregnancy depends mostly on your pre-pregnancy BMI. This calculator applies the widely used Institute of Medicine (IOM) 2009 guidelines for single pregnancies: enter your pre-pregnancy weight and height to get your BMI category and recommended total gain, and add your current week and weight to see the recommended range so far and whether you're on track. It is general guidance only — your doctor or midwife may advise a different target.
Based on IOM 2009 guidelines for single pregnancies. General information only — always follow your doctor or midwife.
Frequently Asked Questions
- What is a pregnancy weight gain calculator?
- It shows your recommended total and weekly weight-gain range during pregnancy based on your pre-pregnancy BMI, following the Institute of Medicine (IOM) guidelines. It helps you check whether your gain is on track for a healthy pregnancy.
- How is healthy pregnancy weight gain determined?
- Recommendations depend on your pre-pregnancy BMI category. Enter your starting weight and height, and the calculator applies the IOM ranges to give your total target plus the weekly pace expected in the second and third trimesters.
- How much weight should I gain during pregnancy?
- Under IOM guidelines, a woman who started at a normal BMI is advised to gain about 11.5 to 16 kg (25 to 35 lb) total. Underweight women are advised to gain more and overweight or obese women less, so your range is individualized.