Due date (pregnancy calculator)

Estimated due date from first day of last period (Naegele's rule).

Input data

Optional: 21–45 days; default 28. Empty field = 28 days.

Abbreviations

  • LMP (last menstrual period) — first day of bleeding of your last period before pregnancy; usual reference in international clinical texts.
  • POM — alternate label sometimes used on forms for the first day of the last menstrual period (same calendar date as LMP here; not conception).
  • EDD (estimated due date) — estimated delivery date shown in the result.

Educational tool only — not a substitute for medical advice.

Results

Enter data and click Calculate.

How the results are calculated