Pregnancy Weight Gain Calculator
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This pregnancy weight gain calculator will target your individual recommended pregnancy weight gain based on your height and weight before pregnancy.

Pregnancy weight gain is healthy because the baby, the uterus, the placenta, the amniotic fluid need to grow. Your baby's growth and development depend on you gaining adequate weight.

Not everyone gains exactly the same amount and how much weight gain you need depends on various factors, including your pre-pregnancy weight and body mass index (BMI). Your health and your baby's health also play a role. Work with your doctor to determine what's right for you.

Pre-pregnancy weight and recommended weight gain. The IOM recommendations for BMI and weight gain are:

  • If you were underweight before pregnancy (for the IOM, that is a BMI of less than 18.5): between about 28 to 40 pounds or 12.5 and 18 kgs extra weight during pregnancy
  • If you were normal weight before pregnancy (for the IOM, that is a BMI between 18.5 and 24.9): between about 25 to 35 pounds or 11.5 and 16 kg extra weight during pregnancy
  • If you were overweight before pregnancy (for the IOM, that is a BMI between 25 and 29.9): between about 15 to 25 pounds  or 7 and 11.5 kg extra weight during pregnancy
  • If you were obese before pregnancy (for the IOM, that is a BMI of over 29.9) about 11 to 20 pounds  or between 5 and 9 kg extra weight during pregnancy
  • If you are very young, then more weight gain is probably needed as teenagers may still be growing themselves.

Your weight alone is not a good enough indicator as to how well your baby is doing — or even of your baby’s weight gain. This depends on a lot of factors. It is not really possible to be sure of the baby’s weight before birth. Ultrasound and other tests can give an indication of how the baby is developing.

Read More:
Pregnancy Weight Gain Guide