How to use the ivf due date calculator
Prepare the values for this calculation
Estimate an IVF due date from embryo-transfer date and embryo age at transfer. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Embryo transfer date: choose a real calendar date. The input uses year, month and day; confirm the date rather than entering an elapsed duration.
- Embryo age at transfer (days): enter a value at least 0 and no more than 7 and a whole number. Use the unit named in the label or selected above. Do not leave this required field blank.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Estimated due date first. With the unchanged example inputs, it is 2026-10-08. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Embryo age at transfer (days) from 5 to 6. The resulting Estimated due date is 2026-10-07. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
IVF Due Date Calculator formula
Estimated due date=transfer date+(266−embryo age in days) days.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Embryo transfer date | YYYY-MM-DD | 2026-01-20 |
| Embryo age at transfer (days) | minimum 0; maximum 7; whole number | 5 |
Worked example
Using the example inputs above, the estimated due date is 2026-10-08.
- Estimated due date
- 2026-10-08
- Embryo age at transfer
- 5 days
Results and assumptions
Educational calculation only; do not use this result by itself to diagnose, treat, or make an urgent medical decision. Use the dating convention given by the treating fertility clinic when it differs.
Fix an input or unexpected result
Embryo age at transfer (days) is required. Enter embryo age at transfer (days) using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.