Estimate when conception likely occurred based on your due date or last menstrual period.
Conception occurs when a sperm fertilizes an egg. This typically happens within 24 hours of ovulation. This calculator works backward from your due date or forward from your last period to estimate when conception likely occurred.
The estimated conception date is approximate. It could vary by several days since sperm can survive up to 5 days and the exact time of ovulation isn't always predictable.