Pregnancy Due Date Calculator
Calculate your due date and pregnancy milestones
Pregnancy Due Date Calculator
Calculate your due date and pregnancy milestones
Range: 21-35 days (default: 28)
About Due Date Calculation
Due dates are calculated by adding 280 days (40 weeks) to the first day of your last menstrual period.
You can use future dates for pregnancy planning purposes.
Important: Only about 5% of babies are born on their exact due date.
For the most accurate dating, your healthcare provider may recommend an ultrasound scan, especially in early pregnancy.
Calculation Methods
Last Menstrual Period (LMP)
Most common method. Adds 280 days to your LMP start date.
Conception Date
If you know when conception occurred. Adds 266 days to conception date.
Cycle Length
Adjusts calculations based on your typical menstrual cycle length.
Next Steps
• Schedule your first prenatal appointment
• Start taking prenatal vitamins
• Consider ultrasound for accurate dating
• Track your pregnancy milestones
• Discuss any questions with your healthcare provider
Range: 21-35 days
Important Information
Only about 5% of babies are born on their exact due date.
Due dates are estimates. Your healthcare provider may recommend an ultrasound for more accurate dating.