Conception Calculator
Health & FitnessEstimate conception date and due date from the last menstrual period.
Calculated Result
2026-01-15
Estimated due date 2026-10-08
Formula: Conception = LMP + 14 · EDD = LMP + 280
About this calculator
Naegele’s rule uses a 28-day cycle. Conception is modeled at day 14. Irregular cycles and known ovulation shift the date. This is not a diagnosis.
How It Works & Formula
FormulaConception ≈ LMP + 14 days · EDD = LMP + 280 days
Conception = LMP + 14 days. EDD = LMP + 280 days.
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