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Due Date Calculator

Enter Last Menstrual Period Information

Please select the start date of your last menstrual period

📋 Calculation Information

  • • Based on Naegele's Rule calculation
  • • Due Date = Last Menstrual Period Date + 280 days
  • • Normal pregnancy duration is 37-42 weeks
  • • Only about 5% of babies are born on their due date

⚠️ Important Reminders

  • • Due date is only an estimate; actual delivery may occur 2 weeks earlier or later
  • • Calculation based on 28-day standard cycle; individual differences may affect accuracy
  • • Please have regular prenatal checkups and follow your doctor's advice
  • • Seek medical attention immediately if you experience any abnormal symptoms
  • • This tool is for reference only and cannot replace professional medical advice