Due Date Calculator
Estimated due date as LMP + 280 days (Naegele), with gestational age and trimester. Not obstetric care.
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How to use Due Date Calculator
- Enter first day of last menstrual period, as of date. Leave a field blank only when the page says the value is missing.
- Read the result rows under the form. Errors appear in the status line. Nothing is uploaded.
- Treat the figures as formula output, not a diagnosis, diet, pregnancy chart, or care plan.
Due Date Calculator
Naegele 280 days
| Computes | Estimated due date as LMP + 280 days (Naegele), with gestational age and trimester. Not obstetric care. |
|---|---|
| Includes | Naegele 280 days |
| Includes | Gestational age |
| Includes | Trimester |
| Engine | dateDiff |
| Upload | None |
| Advice | Informational only |
What Due Date Calculator is
EDD = LMP + 280 days. Gestational age is completed weeks + days from LMP to the as-of date. Trimesters here: first through 13 completed weeks, second 14–27, third 28+.
Informational only. Not a diagnosis, diet plan, pregnancy chart, or medical advice.
The formula runs in this tab. CZNull does not receive the numbers.
How this page computes
Gestational age alone is also gestational age. Ultrasound dating is not applied.
Entities and related jobs
Estimated due date as LMP + 280 days (Naegele), with gestational age and trimester. Not obstetric care. Named features: Naegele 280 days, Gestational age, Trimester.
See also Gestational Age Calculator, Add or Subtract Days, Date Countdown, BMI Calculator, BMR Calculator, TDEE Calculator.
Use cases
A calendar estimate from LMP. Cycles that are not 28 days, IVF, and known conception dates need a clinician.
Not medical advice
Invalid input appears in the status line. IEEE floating point applies unless a row says otherwise. CZNull does not receive the numbers.