Home Online Calculator Pregnancy Calculator Pregnancy Calculator Last Menstrual Period: (MM/DD/YYYY format) Average Length of Cycles: (22 to 45) (defaults to 28) Average Luteal Phase Length: (9 to 16) (defaults to 14) Estimated Conception: Estimated Due Date: Estimated Fetal Age: Free JavaScripts providedby The JavaScript Source Previous Article Net Present Value (NPV) Next Article Simple Interest Calculator