About this Calculator
Determining your estimated due date (EDD) is one of the very first milestones in your pregnancy journey.
Formula & Calculations
Mathematical Formula
LMP + 280, Conception + 266, or IVF Transfer + (261 to 263)
Calculates EDD using three pathways.
How to Calculate Step-by-Step
1
Select method
Choose LMP, Conception, or IVF.
2
Apply IVF factors
Subtract embryo age (3 or 5 days) from transfer.
3
Resolve due date
Calculates expected delivery countdown.
How to Use & Best Practices
Choose calculation basis (LMP, Conception, IVF) and enter dates.
Frequently Asked Questions
Can my due date change?
Yes, standard early ultrasounds can refine clinical due dates.