Different calculators can help determine your due date based on ovulation, date of conception, and ultrasound data. Specific calculators can predict the due dates of people who are using assisted reproductive technologies and embryo transfer. The conception date refers to when a baby was conceived.

Is conception date same as due date?

Most pregnancies last around 40 weeks (or 38 weeks from conception), so typically the best way to estimate your due date is to count 40 weeks, or 280 days, from the first day of your last menstrual period (LMP). Another way to do it is to subtract three months from the first day of your last period and add seven days.

How accurate are due dates for conception?

But data from the Perinatal Institute, a non-profit organisation, shows that an estimated date of delivery is rarely accurate - in fact, a baby is born on its predicted due date just 4% of the time.