Pregnancy Conception Calculator
Estimate your conception date based on due date, last menstrual period, or ultrasound date
Calculate Conception Date
Select your calculation method and enter the required date:
Your Pregnancy Timeline
Enter your information and click "Calculate" to see your pregnancy timeline
About Pregnancy Conception
Conception typically occurs about 11-21 days after the first day of your last menstrual period. This calculator estimates your conception date based on standard pregnancy calculations.
How Conception Works
Conception occurs when a sperm fertilizes an egg. This usually happens in the fallopian tube within 24 hours after ovulation.
Pregnancy Duration
A typical pregnancy lasts about 40 weeks from the first day of your last menstrual period, or 38 weeks from conception.
Accuracy Note
These dates are estimates. Only about 5% of women deliver on their exact due date. Most deliver within 2 weeks before or after.