Conception Date Calculator

Estimate the likely conception date from your last period and cycle length.

First day of last period

Cycle length (days)

Estimated conception

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Likely window—

Estimate only. Confirm with your healthcare provider.

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How it works

Conception ≈ last period + (cycle − 14) days

Frequently Asked Questions

How does the Conception Date Calculator work?

Estimate the likely conception date from your last period and cycle length.

Is this medical advice?

No. It gives general estimates only. For decisions about your health, speak with a qualified professional.