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Twin Pregnancy Guidelines
Twin Pregnancy Weight Gain Calculator
Carrying twins? Weight gain recommendations are significantly higher. ACOG twin-specific guidelines based on your pre-pregnancy BMI.
Twin-specific ACOG
BMI-based
Different to singleton
Twin Pregnancy Weight Gain Calculator — Twin Pregnancy Weight Gain Target
Twin pregnancies require more weight gain. Enter your pre-pregnancy details for your twin-specific target.
⚠ 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
37-54 lbs
Twin pregnancy target
Target at This Week
Enter week
Expected range now
Your BMI Category
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Determines twin range
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
Twin Pregnancy Weight Gain Calculator — Key Information
Normal Weight + TwinsBMI 18.5-24.9: gain 37-54 lbs for twins vs 25-35 for a singleton.
Overweight + TwinsBMI 25-29.9: gain 31-50 lbs for twins.
Obese + TwinsBMI 30+: gain 25-42 lbs for twins.
Why More Weight?Two babies, two placentas, more amniotic fluid and increased blood volume.
Rate of GainAbout 0.5-0.75 lbs per week in the second and third trimesters.
MonitoringTwin pregnancies are monitored more closely. Weight gain tracked at every appointment.