Conception calculator
Estimate the window when conception likely happened, from your last period or your due date. A general guide — your care team confirms dating with a scan.
This tool is educational. Diagnosis and treatment choice must be confirmed by a fertility specialist after reviewing your history and reports.
Common questions
How is the conception date calculated?
Conception usually happens around ovulation. From your last period, that's roughly your cycle length minus 14 days; from a due date, it's about 266 days earlier. The result is an estimated window, not an exact day — an early scan gives more accurate dating.
Is the conception date exact?
No. It's an estimate based on cycle averages, and ovulation timing varies. Use it as a helpful guide. Your care team confirms pregnancy dating with an ultrasound, which is more accurate than any calculator.
Take the next step — gently.
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