Use our free Pregnancy Due Date Calculator to quickly determine your estimated delivery date (EDD). Simply enter your last menstrual period, conception date, or IVF transfer details to get an accurate prediction of when your baby might arrive.
Formula:
While a single mathematical formula doesn't cover all methods, the calculation logic for your Estimated Delivery Date (EDD) is based on the following standard medical guidelines:
- Last Menstrual Period (LMP): EDD = LMP + 280 days (or 40 weeks)
- Conception Date: EDD = Conception Date + 266 days (or 38 weeks)
- IVF Transfer (3-day embryo): EDD = Transfer Date + 263 days (38 weeks - 3 days)
- IVF Transfer (5-day embryo): EDD = Transfer Date + 261 days (38 weeks - 5 days)
This calculator applies these principles to provide your projected due date, offering insights into your pregnancy journey.