Online Pregnancy Weight Gain Calculator


Online pregnancy weight gain calculator, helps you to calculate how much weight, should gain weekly during pregnancy period. You can track your weight and target your individual recommended weight gain based on your height and weight before pregnancy.

Weight before pregnancy
Current weight
Current week of pregnancy
Please, Enter all values correctly.
You were (Based on Pre-pregnancy BMI)
Comparing to current weight you were
Weight gain at 40th week
Weight gain at 1st week
Weight gain at 40th week

How do you know how much weight to gain during pregnancy?

Pregnancy weight gain is normal, expected, and 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. During pregnancy time you need to eat nutritious foods that supply adequate vitamins and minerals for your unborn baby to develop.

Not all pregnant women we have exact weight gain, the weight we are different and how much weight gain depends on various factors, including your pre-pregnancy weight and body mass index (BMI). Your wellbeing and that of your baby also play a part in these. 

Being overweight or underweight during pregnancy can in posse pregnancy complications. In the first few weeks of your prenatal care, you should inform your doctor or midwife about it. They will determine what’s right for you and your baby.

What is a healthy recommended pregnancy weight gain?

The Institute of Medicine (IOM) recommendations for body mass index (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 still very young, then your body may still need more weight gain because your body is still growing as a teenager.

What else besides the fetus grows?

It’s not simply the baby that weighs you down in those later months. Most of the weight gained in physiological conditions goes into the event of tissues that enable fetal development, growth, and breastfeeding. Pregnant women should build up a spread of tissues which will support the nourishment of the fetus, and that they include the fetus, the placenta, amnionic fluid, uterus, blood, and fat.

These tissue area unit accountable for the majority of weight gain throughout the pregnancy period. If weight gain is simply too low, these tissues don’t seem to be totally developed nor functional and fetal development and growth are also compromised.
Your weight alone isn’t an honest enough indicator of how well your baby is doing — or maybe of your baby’s weight gain. This relies on plenty of things. Before birth, it is not possible to be sure of the baby’s weight.. Ultrasound and different pregnancy tests will offer a sign of how well the baby is developing.


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Sharon Olabanji
Sharon Marie olabanji RN, CHO, Founder and CEO of Pregnancyvitamins, has a background in community health, nursing, and nutrition. As a mom of two, I do thorough research and I decide to take good care of my self and tackle health problems during pregnancy and after delivery. is the culmination of her thousands of hours of research and all posts are medically reviewed and verified by the research team.

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