Pregnancy Due Date Calculator: How to Estimate Your Due Date

A pregnancy due date calculator estimates when your baby will be born based on the first day of your last menstrual period (LMP) or the date of conception. The standard due date is 280 days (40 weeks) from LMP.

The LMP method assumes ovulation and conception occur about 14 days after the start of your period. If you know your exact conception date, you can calculate due date as 266 days (38 weeks) from conception.

Due date accuracy varies. Only about 4% of babies are born on their exact due date, and about 70% arrive within 10 days of it. Factors like cycle length and ovulation timing affect accuracy.

Our Due Date Calculator at Age Right Now supports both LMP and conception methods, and also shows gestational age progression week by week.

Use it to get an estimated due date, track pregnancy weeks, and understand the key milestones of each trimester.