Edd Calculator Singapore EDD Calculator Singapore Last Menstrual Period (LMP) ℹSelect the first day of your last menstrual period. Cycle Length (days) ℹTypical menstrual cycle length, usually 28 days. 28 26 30 32 Calculate EDD Reset This calculator estimates your expected due date (EDD) based on the LMP and cycle length. EDD will appear here Enter your LMP and cycle length, then press Calculate EDD.