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Pregnancy Weight Gain Calculator

Track recommended pregnancy weight gain based on your pre-pregnancy BMI using IOM guidelines, with week-by-week expected gain for singleton and twin pregnancies.

Enter weeks 1–42
Medical Disclaimer: Based on IOM (Institute of Medicine) 2009 guidelines. Always consult your OB-GYN or midwife for personalised guidance.
Recommended Total Weight Gain
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Enter your details to calculate
Pre-Pregnancy BMI
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BMI Category
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IOM guideline basis
Expected Gain by Week
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at current gestational week
Remaining to Gain
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to reach midpoint of recommendation
Progress through pregnancy —
Week 1Week 13Week 27Week 40
BMI Category Singleton Gain Twins Gain
Enter your details to see guidelines

* IOM 2009 guidelines. Weight gain is distributed: ~1–4.5 lbs in 1st trimester, then steady weekly gain in 2nd & 3rd trimesters.

About This Health calculator
Pregnancy Weight Gain Calculator
Helpful page content for users and search quality.
Overview
Track recommended pregnancy weight gain based on your pre-pregnancy BMI using IOM guidelines, with week-by-week expected gain for singleton and twin pregnancies. This pregnancy weight gain calculator page is designed to make the calculation easier to understand, faster to repeat, and more practical for everyday use.
How To Use
Enter the required values in the form, review the main result at the top of the output panel, and use the supporting result cards to compare details before changing inputs and recalculating.
Why This Page Helps
A dedicated health calculator page saves time, reduces manual calculation errors, and gives you a cleaner summary of the answer than doing the math by hand in a spreadsheet or on paper.
Important Note
Health calculations on this page are for general education and self-checking only. They should not replace personal medical advice, diagnosis, or treatment from a qualified healthcare professional.