Pregnancy Conception Calculator
Estimate the most likely conception date based on your last menstrual period.
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Your results
Estimated Conception Date
May 4, 2026
- Fertile window
- May 1, 2026 - May 5, 2026
- Estimated due date
- January 25, 2027
How Conception Dates Are Estimated
Conception typically happens 14 days before the next expected period. For a 28-day cycle, that's day 14 of the cycle.
Sperm can survive 3-5 days, so conception can happen from intercourse several days before ovulation.
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Frequently Asked Questions
Can I know the exact conception date?
Rarely — even with a known ovulation date, the fertile window spans about 5 days.