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Pregnancy Conception Calculator

Estimate the conception date implied by an existing pregnancy due date.

How It Works

Estimated fertilization date=due date−266 days. Conception dating has biological and measurement uncertainty.

Scope and Limitations

  • Cannot establish the date of intercourse or paternity. Use clinician-established dating for care.

Reference Sources

FAQs

How does this calculator work?

Estimated fertilization date=due date−266 days. Conception dating has biological and measurement uncertainty.

What assumptions should I check?

Cannot establish the date of intercourse or paternity. Use clinician-established dating for care.