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Pregnancy Conception-Date Estimate

Estimate a possible conception date by counting backward from an estimated due date.

Educational estimate only. This cannot determine the actual conception date, does not provide medical advice, and does not replace a doctor or qualified healthcare professional.

Your inputs

Your result

Enter your information and select Calculate to see the result.

How this calculator works

The estimate subtracts 266 days from the due date, corresponding to approximately 38 weeks after conception.

Change one assumption at a time to see which inputs have the greatest effect on the estimate.

Worked example

The result is a planning estimate, not proof of a specific conception date.

Limitations

Ovulation, fertilization, implantation, and clinical pregnancy dating vary. Only a qualified clinician can interpret pregnancy dating.

Review this educational estimate against current quotes, official information, and your own budget before making a financial decision.