Pregnancy Due Date Calculator
Use this free Pregnancy Due Date Calculator to estimate your baby’s expected due date based on the first day of your last menstrual period (LMP). It helps you track pregnancy progress and important milestones.
Enter your details below and click calculate to get instant results.
Pregnancy Due Date Calculator
What is a Pregnancy Due Date Calculator?
A Pregnancy Due Date Calculator helps estimate your baby’s expected delivery date based on the first day of your last menstrual period (LMP).
Most pregnancies last around 40 weeks or 280 days from the first day of the last period.
This tool helps parents track pregnancy progress and prepare for important milestones.
How Due Date is Calculated
The standard method adds:
280 days (40 weeks)
to the first day of your last menstrual period.
This is the most common medical estimate used by doctors.
Example
Last menstrual period:
January 1
Estimated due date:
Around October 8
This helps give a practical pregnancy timeline.
Why Use This Calculator?
It helps with:
- Tracking pregnancy weeks
- Planning doctor appointments
- Preparing for delivery
- Monitoring baby milestones
- Understanding trimester progress
It provides a simple starting estimate for pregnancy planning.
Important Note
This tool gives an estimated due date only.
Actual delivery may happen before or after the expected date. Ultrasound scans and your doctor provide more accurate medical guidance.
FAQs
Common Questions
How accurate is a due date calculator?
It provides a strong estimate, but exact delivery dates can vary.
Can my due date change?
Yes. Doctors may adjust the due date after ultrasound scans.
Is pregnancy always exactly 40 weeks?
No. Some babies arrive earlier or later than the estimated date.
Can I calculate due date without knowing my last period?
It becomes less accurate. LMP is the most common starting point.