Pregnancy Conception Calculator

Estimate your conception date based on different pregnancy milestones.

Expected Due Date:

First Day of Last Period:

Average Cycle Length (days):

Ultrasound Date:

Gestational Age at Ultrasound (weeks):

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Most Likely Conception Date

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Possible Conception Window

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Current Pregnancy Progress

Understanding Your Results

The Pregnancy Conception Calculator estimates when your baby was conceived based on the information you provide. The "Most Likely Conception Date" is the single most likely day conception occurred, while the "Possible Conception Window" accounts for sperm survival (3-5 days) and ovulation timing.

Key Facts About Conception:

Conception typically occurs 11-21 days after the first day of your last period
Sperm can survive in the female body for 3-5 days
Ovulation usually occurs about 14 days before your next period
The conception date is just an estimate - only 5% of babies are born on their due date