Pregnancy Due Date Calculator
Pregnancy due dates are typically estimated from the first day of your last menstrual period (LMP). Use this calculator to estimate your due date, conception window, and trimester milestones.
Default is 28 days.
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How is a due date calculated?
A standard pregnancy is about 40 weeks (280 days) from the first day of the last menstrual period. This method assumes ovulation occurs around day 14 of a 28-day cycle.
If you know the conception date, the due date is estimated about 38 weeks (266 days) after conception. Cycle length adjustments help refine the estimate when your cycle differs from 28 days.
Due dates are estimates. Actual delivery can vary by several days. Always consult your healthcare provider for personalized guidance.