Pregnancy Due Date Calculator

About Pregnancy Due Date Calculator

This Pregnancy Due Date Calculator helps expectant parents estimate their baby's due date based on the first day of the last menstrual period (LMP) or conception date. The calculator also provides important pregnancy milestones and a timeline of key events.

How Pregnancy Due Dates Are Calculated

The calculator uses established medical formulas to estimate your due date:

• Last Menstrual Period (LMP) method: Due date = LMP + 280 days (40 weeks)
• Conception date method: Due date = Conception date + 266 days (38 weeks)
• Ultrasound adjustment: If ultrasound data is provided, the calculator adjusts the due date based on the difference between the expected and actual gestational age

Understanding Your Results

The calculator provides several important dates and information:

• Due Date: The estimated date of delivery (only 5% of babies are born on their exact due date)
• Gestational Age: How far along the pregnancy is, calculated from the first day of the last menstrual period
• Conception Date: The estimated date when fertilization occurred (typically 11-21 days after LMP)
• Trimesters: Important milestones marking the end of each trimester
• Pregnancy Timeline: Key events and developmental milestones throughout the pregnancy

Important Notes

While this calculator provides useful estimates, every pregnancy is unique:

• Only about 5% of women deliver on their exact due date
• Most babies are born within two weeks before or after the due date
• Your healthcare provider may adjust your due date based on ultrasound measurements
• Factors like irregular cycles or late ovulation can affect the accuracy of LMP-based calculations
• Always consult with your doctor or midwife for personalized medical advice