Pregnancy Due Date Calculator PreviousNextBabies will come when they are ready but using Newborn Baby’s Pregnancy Due Date Calculator can help give you an estimated due date for your baby based on a standard 40 week pregnancy. First Day of last menstural period: 12345678910111213141516171819202122232425262728293031 JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember 20242025 Ususal Number of days in your cycle: 12345678910111213141516171819202122232425262728293031