Estimate Your Baby’s Expected Delivery Date
Our Due Date Calculator helps estimate your baby’s expected delivery date based on the first day of your last menstrual period. Track your pregnancy timeline, trimester progress, and important milestones easily.
Whether you are newly pregnant or planning ahead, this calculator provides a simple way to understand your pregnancy journey.
Due Date Calculator
Estimate your baby’s expected delivery date and track your pregnancy journey.
What Is a Due Date Calculator?
A Due Date Calculator is a pregnancy tool used to estimate:
- Expected delivery date
- Pregnancy week
- Current trimester
- Baby growth timeline
- Important pregnancy milestones
The calculation is commonly based on:
- Last menstrual period (LMP)
- Conception date
- IVF transfer date
How To Use the Due Date Calculator
Using the calculator is quick and simple.
Step 1
Enter the first day of your last menstrual period.
Step 2
Select your average menstrual cycle length if needed.
Step 3
Click calculate to view your estimated due date.
The calculator will instantly display:
- Estimated due date
- Current pregnancy week
- Trimester information
- Pregnancy timeline
How Is Pregnancy Due Date Calculated?
Pregnancy due dates are usually calculated using Naegele’s Rule.
The estimated due date is typically:
- 280 days
- Or 40 weeks
from the first day of the last menstrual period.
Since ovulation usually occurs around two weeks after the last period, this method provides a reliable estimated delivery timeline for most pregnancies.
Understanding Pregnancy Trimesters
First Trimester
Weeks 1 to 12
Baby development begins and early pregnancy symptoms commonly occur.
Second Trimester
Weeks 13 to 27
Many women feel more energetic as the baby continues growing rapidly.
Third Trimester
Weeks 28 to 40
The baby gains weight and prepares for birth.
Why Use a Due Date Calculator?
A Due Date Calculator helps you:
- Prepare for childbirth
- Track pregnancy progress
- Understand baby development
- Plan doctor appointments
- Monitor trimester milestones
- Stay informed throughout pregnancy
Pregnancy Milestones by Week
Week 4–5
Pregnancy tests usually become positive.
Week 8
Baby’s heartbeat can often be detected.
Week 12
End of the first trimester.
Week 20
Detailed anomaly scan is commonly performed.
Week 28
Beginning of the third trimester.
Week 37–40
Full-term pregnancy period.
Factors That Can Affect Due Dates
Actual delivery dates may vary due to:
- Irregular menstrual cycles
- Ovulation timing differences
- Multiple pregnancy
- IVF pregnancy
- Maternal health conditions
Only a small percentage of babies are born exactly on the estimated due date.
Frequently Asked Questions
How accurate is a Due Date Calculator?
The calculator provides an estimated delivery date. Ultrasound scans may help confirm pregnancy dating more accurately.
Can due dates change during pregnancy?
Yes. Doctors may adjust due dates based on ultrasound findings and baby growth.
Is pregnancy always exactly 40 weeks?
No. Full-term pregnancies commonly range between 37 and 42 weeks.
Can I calculate due date from conception?
Yes. Due dates can also be estimated using conception or IVF transfer dates.
What if I have irregular periods?
Women with irregular cycles may require ultrasound dating for more accurate results.