Conception Date Calculator
Use our Conception Date Calculator to find your likely conception date by entering your due date or last menstrual period. It estimates your conception window to clarify your pregnancy timeline.
Calculate your estimated conception date and due date based on your last menstrual period. Get a range of possible conception dates and important pregnancy milestones.
Calculate Your Dates
A typical menstrual cycle is 28 days, but can range from 21 to 35 days
Your Results
Estimated Conception Window
Estimated Due Date
Current Week of Pregnancy
Current Trimester
Next Pregnancy Milestone
How to Use
- Enter the first day of your last menstrual period
- Select your average menstrual cycle length
- Click Calculate to see your results
- Review your conception window and important dates
Important Pregnancy Dates
First Trimester: Weeks 1-12
Missed Period (4 weeks)
First Ultrasound (8 weeks)
End of First Trimester (12 weeks)
Second Trimester: Weeks 13-26
Anatomy Scan (20 weeks)
Viability (24 weeks)
Third Trimester: Weeks 27-40
Third Trimester Begins (28 weeks)
Full Term (37 weeks)
Due Date (40 weeks)
