Pregnancy Weight Calculator


    Pregnancy Weight Gain Calculator

    Each pregnancy is unique, and pregnancy weight gain may vary between women, and even between pregnancies. Try not to worry too much about weight gain, and instead focus on eating a healthy, balanced diet rich in fresh fruits and vegetables.

    This pregnancy weight gain calculator takes into account your height, weight and age to give you a general idea of how much weight you are expected to gain during pregnancy.

    Select your conversion units

    Weight lbs

    Height ft

    Teen Mother
    Expecting Twins
    Pre-pregnancy BMI
    Expected weight gain


    Week Gain Weight Gain Weight Gain Weight

    This information is not intended to replace the advice of a trained medical doctor. Health & Parenting LTD disclaims any liability for the decisions you make based on this information, which is provided to you on a general information basis only and not as a substitute for personalized medical advice.

    All contents copyright © Health & Parenting Ltd 2014. All rights reserved.

    The calculations use your pre-pregnancy BMI to determine your weight gain goal. If you have a:

    • Underweight BMI of less than 19 you will be advised to gain between 13 and 18kg (28 to 40lb).
    • Normal Normal BMI (between 19 and 24) you should expect to gain between 11 and 16kg (25 to 35lb).
    • Overweight BMI of 24.5 to 29.5 you should aim to gain between 7 and 11kg (15 to 25lb).
    • Obese BMI of 30 or more you should aim to gain 5 to 9kg (11 to 20lb).

    If you are carrying multiples, you should expect to gain extra. For twins, it could be an extra 4.5kg (10lb) by the end of the pregnancy, and this amount could increase for triplets or more.

    Where does the weight go?

    Maternal stores of nutrients and muscle development 7
    Increased body fluid 4
    Increased blood 3 – 4
    Breast growth 1 – 2
    Enlarged uterus 3 – 4
    Amniotic fluid 1 – 2
    Placentia 3 – 4
    Baby 6 – 8
    Source: American College of Obstetricians and Gynecologists

    If your pre-pregnancy BMI was between 19 and 24, you may put on around 2kg (4lb) during the first trimester. In the second and third trimesters, you may gain as much as 0.5kg (1lb) a week, though this will decrease to just 0.5-1kg (1-2lb) during the final month of the pregnancy.

    If you are worried about your weight gain, please speak to your healthcare provider.