Pregnancy Conception Calculator
The Pregnancy Conception Calculator estimates the date of conception based on the expected due date of the pregnancy, last period date, or ultrasound date. The date of conception is the day on which a person's baby is conceived. The calculator also estimates a possible range of days during which sexual intercourse might have led to conception based on sperm being viable for 3-5 days within a woman's body.
Calculator Inputs
About Conception Calculation
Conception Date: The date of conception is typically calculated as 14 days after the first day of your last menstrual period (LMP). This assumes a 28-day menstrual cycle with ovulation occurring on day 14.
Ovulation: Ovulation usually occurs around day 14 of a 28-day cycle, but this can vary. The egg is viable for about 12-24 hours after ovulation, while sperm can survive in the female reproductive tract for 3-5 days.
Fertility Window: The most fertile period is typically 5 days before ovulation through the day of ovulation. This calculator estimates the possible range of intercourse dates that could have led to conception.