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Due Date Calculator Examples

Reproduce three pregnancy due date examples using LMP with cycle adjustment, ultrasound gestational age, and IVF transfer dates with engine-calculated results.

How should you use these Due Date Calculator examples?

These examples turn the Due Date Calculator inputs into complete scenarios with stated values, calculation steps, and interpreted results. Use them to check how the calculator behaves, compare your own situation with realistic cases, and identify which inputs have the greatest effect before relying on an estimate.

These examples use the same engine as the Due Date Calculator. They demonstrate date arithmetic and do not establish the best obstetric estimate for an individual pregnancy.

Example 1: LMP with a 32-Day Cycle

Enter LMP Feb 22, 2026, average cycle length 32 days, and as-of date Jul 31, 2026. The cycle is four days longer than the 28-day reference.

EDD=LMP+280+(32−28)=LMP+284daysEDD=LMP+280+(32-28)=LMP+284 days
Estimated due dateDec 3, 2026
Estimated conceptionMar 12, 2026
Gestational age22 weeks, 1 days
Pregnancy weekWeek 23
TrimesterSecond trimester
Progress55%

Example 2: Ultrasound Dating

Enter scan date Aug 1, 2026 with recorded gestational age 22 weeks 6 days. Use Jul 31, 2026 as the progress date.

EDD=ScanDate+280−(22×7+6)=ScanDate+120daysEDD=ScanDate+280-(22\times7+6)=ScanDate+120 days
Estimated due dateNov 29, 2026
Estimated LMPFeb 22, 2026
Gestational age on as-of date22 weeks, 5 days
Pregnancy weekWeek 23
Full term beginsNov 22, 2026
Days until EDD121

Example 3: Five-Day Embryo Transfer

Enter IVF transfer date Mar 13, 2026, embryo age 5 days, and as-of date Sep 1, 2026.

EDD=TransferDate+266−5=TransferDate+261daysEDD=TransferDate+266-5=TransferDate+261 days
Estimated due dateNov 29, 2026
Estimated conceptionMar 8, 2026
Gestational age27 weeks, 2 days
Pregnancy weekWeek 28
TrimesterSecond trimester
Estimated progress68%

Compare the Three Pregnancy Examples

ScenarioDating methodAs-of dateEstimated due dateGestational age
Example 1LMP, 32-day cycleJul 31, 2026Dec 3, 202622w 1d
Example 2UltrasoundJul 31, 2026Nov 29, 202622w 5d
Example 3IVF transferSep 1, 2026Nov 29, 202627w 2d

Examples 2 and 3 use compatible source dates and therefore converge on the same EDD. Example 1 intentionally uses a different cycle assumption and produces a different estimate.

How to Reproduce the Results

For “How to Reproduce the Results,” the Due Date Calculator examples organizes the relevant inputs, applies the documented method, and shows a result that can be compared across scenarios. The points below identify the specific considerations and assumptions users should review before relying on the estimate.

  1. Open the Due Date Calculator.
  2. Select the dating method used by the example.
  3. Enter the same as-of date.
  4. Enter the source date and method-specific values exactly as shown.
  5. Calculate and compare EDD, gestational age, week, trimester, progress, charts, and schedule.

Review the Pregnancy Due Date Formula page for the exact calendar operations.

References

These references support the calculation method, assumptions, or current program guidance.

Corrections and Review

Report an issue or error in the calculator using the Contact Us page.

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