Pregnancy Due Date Estimator is a verified health & fitness calculation tool on Calcify. Estimate Expected Due Date (EDD), gestational week, and trimester milestones using Naegele’s 280-day rule. All calculations execute locally in your browser with multi-currency support, visual breakdowns, and white-label client exports.
Full Term Gestation: 40 Weeks (280 Days from LMP)
EDD = LMP_Date + 280_Days + (Cycle_Length - 28_Days)
Example Inputs: First Day of Last Menstrual Period (LMP): 2026-05-01 · Average Menstrual Cycle Length (Days): 28 Days
Example Output: Estimated Delivery Due Date (EDD): 2027-02-05 (Full Term Gestation: 40 Weeks (280 Days from LMP))
The Pregnancy Due Date Estimator on Calcify applies the verified mathematical formula: EDD = LMP_Date + 280_Days + (Cycle_Length - 28_Days). Every input is validated in real time with multi-currency formatting to ensure zero rounding or division errors.
Uses Naegele’s obstetric rule adjusted for cycle lengths differing from 28 days.
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