👶 Pregnancy Due Date Calculator
Estimate your due date from the first day of your last menstrual period (LMP).
—estimated due date
How to use the Pregnancy Due Date Calculator
Enter the first day of your last menstrual period (LMP). The calculator uses Naegele's rule (LMP + 280 days) to estimate the due date, adjusted for cycle length variation from the standard 28-day cycle.
Important: This is an estimate only. Most babies are born within 2 weeks before or after the due date. Confirm with your doctor — ultrasound is more accurate, especially in the first trimester.