Gestational age counts the days since conception or the last menstrual period. Estimated Due Date (EDD) predicts childbirth timing. Knowing both terms assists prenatal planning and emotional preparation. You will reference them during medical appointments, scheduling work leave and arranging newborn essentials.
This calculator predicts a due date instantly. Choose last-period or conception method, enter dates and cycle length, then receive continuous updates. Real-time feedback removes manual chart counting and reduces calculation mistakes. Parents and healthcare professionals gain a quick baseline before formal ultrasounds.
Use the results to schedule antenatal visits, vitamins and parental classes. Remaining-time and trimester indicators guide lifestyle adjustments. Share the calculated EDD with family and caregivers for coordinated support. Combine the figures with professional advice for safer, more confident pregnancies.
Technical Details:
The list below explains internal logic and data handling.
- Select last-period or conception date calculation.
- Custom cycle length accounts for irregular periods.
- EDD updates automatically after every change.
- Trimester tracker labels current pregnancy stage.
- Remaining-days counter refreshes daily.
- Data never leaves the browser, ensuring privacy.
- URL parameters preserve inputs for easy sharing.
| Formula | Context |
|---|---|
| EDD = LMP + 280 days − (28 − cycle) | Last-period method |
| EDD = Conception + 266 days | Conception method |
Calculations-and-Scoring:
Understand, validate and apply outputs.
Formula Breakdown
Gestation averages 280 days from last period. Cycle adjustment aligns shorter or longer cycles.
Worked Example
A 30-day cycle with LMP on 1 Jan yields EDD on 6 Oct.
Interpretation
The EDD is an estimate; fewer than 5 % of births occur exactly on that date.
Recommendations
Consult healthcare providers for ultrasound dating and personalised prenatal schedules.
Step-by-Step Guide:
Follow these steps for accurate results.
- Select a calculation method radio button.
- Pick the reference date in the calendar field.
- Enter your typical cycle length in days.
- Review the estimated due date line.
- Note remaining time and trimester status.
- Bookmark the page to monitor daily progress.
FAQ:
Answers clarify frequent concerns.
How accurate is the due date?
It offers a statistical midpoint; natural variation may shift delivery by two weeks.
Does the tool handle leap years?
Yes. JavaScript date arithmetic accounts for leap-year days.
Is my information stored externally?
No. All data remains locally within your browser session.
Can I change cycle length later?
Yes. Adjust the number field; the EDD recalculates immediately.
Should I replace medical advice with this result?
Never. Always consult qualified healthcare professionals for personalised guidance.
This calculator offers informational estimates, not medical advice.