Pregnancy Due Date Calculator

Our Pregnancy Due Date Calculator helps you estimate your baby's arrival date, a crucial piece of information for planning and preparing for parenthood. Knowing your due date allows you to track trimester milestones, schedule prenatal appointments, and anticipate important health checks throughout 2026. This tool provides an estimated due date based on your last menstrual period, conception date, or IVF transfer date.

The calculator primarily uses Naegele's Rule for last menstrual period (LMP) calculations, which adds 280 days (40 weeks) to the first day of your last period. For conception dates, it adds 266 days (38 weeks) from the estimated date of fertilization. For IVF transfers, it adds 266 days minus the age of the embryo at transfer (e.g., for a 5-day blastocyst, it adds 261 days) to the transfer date.

Remember that due dates are estimates, and only about 5% of babies are born exactly on their due date. Factors like irregular periods can make LMP-based calculations less accurate, so always confirm with your healthcare provider. Avoid solely relying on this calculator for medical advice; it's a planning tool.