Pregnancy Due Date Calculator
Pregnancy Due Date Calculator
Calculate your estimated due date based on your last menstrual period or date of conception.
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Understanding Your Pregnancy Timeline
An estimated due date (EDD) is a prediction of when your baby will be born. While only about 4% of babies are born on their exact due date, it provides a crucial timeline for prenatal care and preparation.
Standard Assumptions
The LMP Method assumes a standard 28-day menstrual cycle where ovulation occurred exactly on Day 14. If you have a longer or shorter cycle, your actual "gestational age" and due date may shift.
Last Menstrual Period (LMP) Method
This is the most common method used by healthcare providers. The due date is set at 280 days (40 weeks) from the first day of your last period.
Conception Date Method
If you know the exact date of conception (common with IVF or precise tracking), this method is often more accurate. The due date is set at 266 days (38 weeks) from conception.
Clinical Logic
- Gestational Age: Measured from the first day of the last period, even though you aren't pregnant for the first ~2 weeks.
- Trimesters: 1st (Weeks 1-13), 2nd (Weeks 14-27), 3rd (Weeks 28+).