Pregnancy due date calculator Free Pregnancy Calculator | Due Date, Conception Date Calculation Pregnancy Calculator Date of Last Menstrual Period:Date 12345678910111213141516171819202122232425262728293031Month123456789101112YearDue Date, Conception Date Calculation Results:Estimated Fertility Dates :to Estimated Conception Date : First Trimester Ends(12 Weeks) : Second Trimester Ends(27 Weeks): Estimated Due Date(40 Weeks) :