Pregnancy Weight Gain Calculator
Find out your recommended weight gain range based on your pre-pregnancy BMI and current week of pregnancy.
Pre-pregnancy BMI
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Gained so far
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Recommended total
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IOM 2009 guidelines
BMI position
UnderweightNormalOverweightObese
Recommended weight gain by trimester
1st trimester (weeks 1–13)
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2nd trimester (weeks 14–27)
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3rd trimester (weeks 28–40)
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Expected gain by week —
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Recommended
Your gain
This calculator is based on IoM 2009 guidelines and is for general reference only. Each pregnancy is unique — speak to your midwife or doctor for personalised advice.
