🤮 Due Date Calculator
Estimate your pregnancy due date using last menstrual period, conception date, or IVF transfer date. See gestational age, trimester, and key milestone appointments.
Calculation Method
days
Estimated Due Date
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Weeks Pregnant
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Days Along
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Current Trimester
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Weeks Remaining
Pregnancy Progress
Wk 1–13Wk 14–26Wk 27–40
Progress—
Pregnancy Milestones
Key Prenatal Appointments
Important Notice: This calculator provides an estimate only. Due dates are approximate — only about 5% of babies are born on their exact due date. Gestational age is most accurately determined by your healthcare provider using ultrasound dating. Always consult your midwife, OB, or GP for personalised care.
About Naegele's Rule
The most common due date method adds 280 days (40 weeks) to the first day of your last menstrual period. This assumes a 28-day cycle with ovulation on day 14. For cycles other than 28 days, the estimated ovulation day is adjusted accordingly. IVF due dates are calculated by adding days back from the transfer date to determine the equivalent LMP, then adding 266 days.