Pregnancy Conception Calculator

Estimate your conception date based on your due date, last menstrual period, or current pregnancy stage.

Conception Date Calculation

Calculate Conception Date From:

Due Date:

Last Menstrual Period Date:

Current Gestational Age:

weeks days

Average Cycle Length (days): Most women have cycles between 21-35 days. The average is 28 days.

About Conception Date Calculation

Conception typically occurs during ovulation, which usually happens around 14 days before your next expected period. However, this can vary based on your individual cycle length.

How Conception Works:

Ovulation: An egg is released from the ovary
Fertilization: Sperm meets egg in the fallopian tube
Conception: The fertilized egg begins to develop
Implantation: The embryo attaches to the uterine wall (6-12 days after conception)

Fertile Window:

The fertile window is typically 6 days long - the 5 days before ovulation and the day of ovulation. Sperm can survive in the female reproductive tract for up to 5 days, while an egg is viable for about 24 hours after ovulation.

Factors Affecting Accuracy:

Irregular menstrual cycles
Cycle length variations
Late or early ovulation
Hormonal factors

Note: These calculations provide estimates based on average cycle patterns. For the most accurate dating, consult with your healthcare provider and consider early pregnancy ultrasounds.