Estimate baby's expected due date, current gestational age in weeks, and trimester progress.
Result
This is a reference estimate based on Naegele's rule. Actual delivery timing should be confirmed via ultrasound scan.
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Estimated Due Date = Last Menstrual Period (LMP) + 280 Days (40 Weeks)
LMP date: 01-Jan-2026, 28-day cycle.
Estimated Due Date: 08-Oct-2026 (40 Weeks Gestation).
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Open calculatorNaegele's rule adds 1 year, subtracts 3 months, and adds 7 days to the first day of your last menstrual period (amounting to 280 days or 40 weeks).
Only about 4% to 5% of babies are born on their exact predicted due date; full-term birth normally occurs anywhere between 37 and 42 weeks.
Pregnancy is clinically dated from the first day of the last menstrual period because ovulation and conception dates are rarely known with exact precision. Clinical ultrasound scans provide the definitive crown-rump length (CRL) dating.