Pregnancy Tools Due Date CalculatorExpected Due Date Calculator Expected Due Date Calculator Date of the last menstrual period: Day 12345678910111213141516171819202122232425262728293031 Month JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember Year Calculation results for pregnancy and expected due date: Estimated fertility date: to Expected start date of pregnancy: End date of the first trimester (12 weeks): End date of the second trimester (27 weeks): Expected due date (40 weeks): Calculator developed by MedCalcHub