How accurate is the due date calculator?

While the calculator provides an estimate based on the standard 280-day pregnancy, only about 5% of babies are born on their exact due date. Most babies are born within 2 weeks before or after the estimated date.

What if I have irregular periods?

If you have irregular periods, the due date calculation may be less accurate. In such cases, an early ultrasound measurement can provide a more precise estimate of your due date.

Due Date Calculator - Calculate Your Baby's Due Date

Enter your last menstrual period date to find out your baby's estimated due date. The calculation is based on the medically accepted Naegele's Rule.

📅 Calculate

❓ How is the Due Date Calculated?

The estimated due date is calculated as 280 days (40 weeks) from the last menstrual period. This calculation method is known as Naegele's Rule and is widely used worldwide.

🔔 Important Notes

This calculation is only an estimate and does not show the exact birth date.
Babies are usually born 2 weeks before or 2 weeks after the estimated date.
Calculations may vary for women with irregular menstrual cycles.
For an accurate date, consult your doctor and have an ultrasound.
First trimester ultrasound measurements provide the most accurate date estimate.

📊 Pregnancy Periods (Trimesters)

1st Trimester (Weeks 1-12)

Baby's basic organs begin to form. Nausea and fatigue are common.

2nd Trimester (Weeks 13-26)

The most comfortable period. Baby movements start to be felt.

3rd Trimester (Weeks 27-40)

Baby grows rapidly and prepares for birth. Belly becomes heavier.

More Information

Check out our articles about what to watch for during pregnancy and baby development.

Baby Development Articles →

Due Date Calculator