CalculatorPregnancy Due Date Calculator Due Date CalculatorUse our calculator to estimate your pragenancy due date First day of your last menstrual period (LMP): Select Day Select MonthJanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember Select Year Average cycle duration (in days): Get my due date Clear Result Consult Doctor for assistance.