Is the conception date exact?

No. Conception is a window of about 24-48 hours, and implantation timing adds another day or two. The result is your best central estimate.

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Conception Date Calculator

Back-calculate when conception most likely happened from your due date or last period, useful for tracking ultrasound dating.

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Estimated due date

Cycle length (days)

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Is the conception date exact?: No. Conception is a window of about 24-48 hours, and implantation timing adds another day or two. The result is your best central estimate.