Your pregnancy timeline
Enter your LMP to estimate the due date.
Fill in your last period date and usual cycle length, then click "Calculate due date" to view the estimate and gestational age.
Due date calculator
Enter your last menstrual period (LMP) and typical cycle length to estimate your due date and current gestational age.
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Reading the pregnancy due date calculator
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Estimating your due date
The tool applies Naegele’s rule (LMP + 280 days). Adjust your typical cycle length to tailor the estimate.
Key fields
- LMP Enter the first day of your last menstrual period.
- Cycle length The rule assumes 28 days. If your cycles are regular but different, adjust to refine the estimate.
- Reference date Defaults to today; change it if you want the gestational age for another date.
Interpretation
The estimated due date is indicative. Many pregnancies conclude between weeks 38 and 41. Use the timeline to plan key milestones (scans, tests, birth plan).
Recommendations
- Share the estimate with your care team and confirm gestational age with ultrasound.
- Update the reference date after each check-up to track pregnancy progress.