Due Date Calculator
Calculate your estimated due date and key pregnancy milestones based on your last menstrual period or conception date
About this calculator
The Due Date Calculator helps expectant mothers determine their estimated delivery date and track important pregnancy milestones. By using either your last menstrual period (LMP) or conception date, this tool calculates when your baby is likely to arrive and provides a timeline of key developmental stages throughout your pregnancy. This information is essential for planning prenatal care, scheduling appointments, and preparing for your baby's arrival.
How to use
Simply enter either your last menstrual period date or your known conception date into the calculator. The tool will automatically compute your estimated due date based on the standard 280-day pregnancy cycle. You'll receive your calculated due date along with important pregnancy milestones and trimester breakdowns.
Frequently asked questions
How accurate is the due date calculator?
The calculator provides an estimate based on average pregnancy length. Only about 5% of babies are born on their exact due date, with most arriving within two weeks.
What's the difference between using LMP vs conception date?
LMP method adds 280 days from your last period, while conception date adds 266 days. LMP is more commonly used by healthcare providers.
Can the due date change during pregnancy?
Yes, your healthcare provider may adjust your due date based on ultrasound measurements, especially if done in the first trimester when dating is most accurate.