Whether you’re curious about timing for medical purposes or simply want to understand your pregnancy timeline better, knowing your likely conception date fills in an important piece of the picture. Our pregnancy conception calculator estimates this date based on your last menstrual period or your due date, working backward using standard pregnancy timelines.
Since ovulation and conception typically happen within a narrow window each cycle, this estimate tends to be fairly reliable for people with regular cycles, though it becomes less precise for those with irregular cycles. Your doctor may adjust this timeline based on early ultrasound measurements, which are often considered more accurate than calculation-based estimates.
If you’re still trying to conceive, our pregnancy ovulation calculator can help you identify your fertile window in advance. And once you have a confirmed or estimated conception date, our pregnancy due date calculator projects when you can expect to deliver.