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ACOG Guidelines 2026
Pregnancy Weight Gain Calculator
Find out exactly how much weight you should gain during pregnancy based on your pre-pregnancy BMI. Based on ACOG official guidelines.
ACOG guidelines
BMI-based
Week-by-week
Free
Pregnancy Weight Gain Calculator — Your Personalised Weight Gain Target
Enter your pre-pregnancy weight, height and current week. The calculator uses your BMI to give you the ACOG-recommended weight gain range.
⚠ This calculator uses ACOG (American College of Obstetricians and Gynecologists) guidelines. Always follow your healthcare provider’s advice for your specific pregnancy.
1–40 weeks
Leave blank to see targets only
Recommended Total Gain
25-35 lbs
Full pregnancy target
Target at This Week
Enter week
Expected range now
Your Pre-Pregnancy BMI
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Determines category
Weight Gain Progress
0 lbs gainedTarget range
ACOG Recommended Weight Gain by BMI Category
Underweight
28-40 lbs
BMI < 18.5
Normal
25-35 lbs
BMI 18.5-24.9
Overweight
15-25 lbs
BMI 25-29.9
Obese
11-20 lbs
BMI ≥ 30
Pregnancy Weight Gain Calculator — Key Information
Normal WeightBMI 18.5-24.9: gain 25-35 lbs (11-16 kg) total.
UnderweightBMI under 18.5: gain 28-40 lbs (13-18 kg) total.
OverweightBMI 25-29.9: gain 15-25 lbs (7-11 kg) total.
ObeseBMI 30+: gain 11-20 lbs (5-9 kg) total.
First TrimesterMost women gain only 1-4.5 lbs in the first 13 weeks.
2nd & 3rd TrimesterNormal weight: roughly 0.5-1 lb per week from week 14 onward.