Which method is more accurate?

If you know your exact conception date, that method may be more accurate. However, most people use LMP dating because it's easier to remember the first day of the last period than the exact conception date.

Due Date Calculator – Pregnancy Due Date Estimator

Calculate your pregnancy due date using last menstrual period or conception date. Get accurate pregnancy timeline and milestones.

Due Date Calculator – Pregnancy Due Date Estimator

Calculate your pregnancy due date using last menstrual period or conception date. Get accurate pregnancy timeline and milestones.

Calculation Method*

Choose calculation method

Reference Date*

LMP or conception date

🤱

Enter your last period date to see pregnancy progress

Calculating Your Due Date

Due date calculation helps you and your healthcare provider track pregnancy progress and plan for delivery. While only about 5% of babies arrive on their exact due date, it provides an important reference point for prenatal care.