A familiar situation
Compare conventional due-date estimates using the dating information available from a cycle or IVF transfer.
How to use this calculator
- Enter dating method, selected date.
- Select Calculate to see the answer and its breakdown.
- Keep a scenario, change an input and compare the results.
Use consistent units and check the assumptions below before applying the result.
How due date is calculated
LMP dating adds 280 days; conception dating adds 266 days; a day-5 embryo transfer adds 261 days. These are conventional estimates rather than a prediction of the delivery date. A day-5 embryo transfer on March 1 gives an estimated due date 261 days later.
EDD=LMP+280 d; conception+266 d; day-5 transfer+261 d.A day-5 embryo transfer on March 1 gives an estimated due date 261 days later.
Assumptions & useful context
Confirm dating with prenatal care; an estimated due date does not predict exact delivery day.
Health calculations are estimates for education. They cannot diagnose a condition or replace a clinician’s assessment. Individual needs vary, especially during pregnancy, illness and growth.
Frequently asked questions
Which date should I trust?
Use the date selected by your prenatal clinician, who can account for ultrasound and treatment details.
Does a due date mean labor begins that day?
No. It is a reference point for pregnancy dating.