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What Is an LMP Due Date Calculator? An LMP Due Date Calculator is a digital tool that estimates a woman’s Estimated Due Date (EDD) based on the first day of her Last Menstrual Period (LMP). It assumes a regular 28-day menstrual cycle and calculates the due date by adding 280 days (or 40 weeks) to the LMP. While ultrasound and ovulation tracking can also estimate due dates, LMP-based calculation is the most commonly used method, especially in the early stages of pregnancy. This pregnancy calculator will give you a estimated date of when your baby is due if you know the date of the first day of your last menstrual period (LMP). Estimated Due Date (EDD) Calculator Calculate your estimated due date and track pregnancy milestones based on your last menstrual period (LMP) or conception date. This calculator provides comprehensive pregnancy timeline information for expectant parents and healthcare providers. This pregnancy calculator will give you a estimated date of when your baby is due if you know the date of the first day of your last menstrual period (LMP).