Pregnancy Weight Calculator
Track healthy pregnancy weight gain by week using IOM guidelines for your pre-pregnancy BMI
Enter Your Details
Your Target
Total gain (full term)
11.5 – 16.0 kg
Weekly rate (2nd/3rd tri)
0.4 – 0.5 kg/wk
Based on Institute of Medicine (IOM) guidelines for a normal weight pre-pregnancy BMI. Twin or triplet pregnancies need higher targets — ask your provider.
About this Tool
This tracker applies Institute of Medicine (IOM) weight-gain guidelines to your pre-pregnancy BMI and current week. It shows your BMI category, the recommended total gain for a full-term singleton pregnancy, and the target range you should have gained so far — so you and your provider can spot trends early.
Common Use Cases
Weekly Check-ins
Compare scale readings against the gained-so-far range at each prenatal week.
Set a Total Goal
Know your full-term target range from the first trimester onward.
Doctor Discussions
Bring your trend to appointments to guide nutrition and activity advice.
Postpartum Planning
Staying near the recommended range makes returning to pre-pregnancy weight easier.
Pro Tips
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Weigh Consistently
Weigh weekly, same time of day and clothing, and look at the trend — not single readings.
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Eat for Nourishment
Most people need no extra calories in trimester 1, ~340 extra in trimester 2 and ~450 in trimester 3.
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Not Medical Advice
IOM ranges are general guidance for singleton pregnancies. Always follow your own doctor's advice, especially with twins or health conditions.
FAQs
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