Estimate your conception date based on your due date or last menstrual period. Learn about your most fertile window around conception.
Enter your values below
Enter your estimated due date if known.
Or enter your last menstrual period.
How this calculator works
Estimates conception date by subtracting 266 days from the due date, or adding 14 days to the LMP (ovulation day).
Common questions about this calculator
These calculators are for informational purposes only. While we strive for accuracy, results should not be used as the sole basis for important decisions.
