Conception Date Calculator
Estimate the conception date based on an expected due date. Useful when you have the due date from a healthcare provider but want to know the approximate conception window.
The estimate assumes a 28-day cycle with mid-cycle ovulation. Actual conception can vary by several days.
Enter the due date
Pick an estimated due date to back-calculate conception.
Frequently asked questions
How is conception estimated?
We subtract 280 days from the due date to estimate the LMP and add 14 days for ovulation, giving the estimated conception date.
Is this exact?
No. Conception varies with cycle length and ovulation timing. The result is informational only.
Can I enter the LMP instead?
Use the Pregnancy Due Date Calculator if you have the LMP — it returns the estimated conception alongside the due date.
Is this medical advice?
No. Always consult a healthcare provider for pregnancy timing.