Gestational Age Calculator
Gestational age from LMP, estimated due date, and trimester. Same 280-day rule as the due-date page.
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How to use Gestational Age 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.
Gestational Age Calculator
Weeks + days
| Computes | Gestational age from LMP, estimated due date, and trimester. Same 280-day rule as the due-date page. |
|---|---|
| Includes | Weeks + days |
| Includes | EDD |
| Includes | Trimester |
| Engine | dateDiff |
| Upload | None |
| Advice | Informational only |
What Gestational Age Calculator is
Days from LMP, then weeks + leftover days. EDD is still LMP + 280. Day of pregnancy is days + 1.
Informational only. Not a diagnosis, diet plan, pregnancy chart, or medical advice.
The formula runs in this tab. CZNull does not receive the numbers.
Entities and related jobs
Gestational age from LMP, estimated due date, and trimester. Same 280-day rule as the due-date page. Named features: Weeks + days, EDD, Trimester.
See also Due Date Calculator, Date Difference Calculator, Date Countdown, BMI Calculator, BMR Calculator, TDEE Calculator.
Use cases
Tracking weeks from LMP. Not a substitute for a dating scan.
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.