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Pregnancy Conception Calculator: Estimate Your Due DateBy Calculator Academy / August 9, 2025 Pregnancy Conception Calculator Estimate your due date and key pregnancy milestones. Enter Your Details Calculate from my: Last Period Conception Date First Day of Last Period Average Cycle Length 28 days Your Results Estimated Due Date N/A You are (Gestational Age) 0 weeks, 0 days Current Trimester N/A Estimated Conception N/A Fertile Window N/A Your selected date is in the future. The calculations are based on a potential future pregnancy. Pregnancy Timeline You are here End of 1st End of 2nd Conception Trimester 2 Due Date Enter a date to see your results.