Conception Calculator

Estimate conception date based on due date or last period. Discover when your pregnancy journey likely began.

Expected Due Date

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Trace the Beginning of Life

Curious about when it all started? Our Conception Calculator works backward from your due date or forward from your last period to estimate the magical moment of conception. While doctors date pregnancy from the Last Menstrual Period (LMP), conception actually happens about 2 weeks later during ovulation. This tool helps bridge that gap and identify the likely window of fertilization.

The Fertile Window Revealed

Knowing your likely conception date also reveals your most fertile days for that cycle. Whether you're retrospectively tracking a successful pregnancy or planning for a future one, understanding this timeline is empowering. This calculator assumes a standard 28-day cycle but provides a solid baseline for understanding fetal age versus gestational age (which is always 2 weeks older!).

Biology Fact: Sperm can survive inside the female body for up to 5 days, waiting for an egg. This means "conception" can actually occur days after intercourse!

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