This calculator helps you estimate your date of delivery ("due date") based on the timing of your last menstrual period. Gestational age estimates how far along you are in your pregnancy. EDD calculator provides you with your Estimated Date of Delivery based on the ultrasound results and your last menstrual period date. Accurate EDD Calculator with Week-by-Week Pregnancy Tracking. Calculate Due Date via LMP, Ultrasound, IVF & Conception Dates. Trusted by 500,000+ Expectant Parents Worldwide. 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).