LMP Calculator – Estimate Due Date
Accurately calculate your estimated due date using your Last Menstrual Period (LMP).
Select the first day of your last menstrual period
| Variable | Description | Unit |
|---|---|---|
| LMP | Last Menstrual Period | Date |
| EDD | Estimated Due Date | Date |
| Gestational Age | Age of pregnancy | Weeks/Days |
About LMP Calculations
LMP stands for Last Menstrual Period, which is the first day of a woman’s most recent menstrual cycle. It is commonly used to estimate the due date of a pregnancy. The due date is typically calculated as 280 days (40 weeks) from the first day of the LMP. This method is based on the assumption that a normal pregnancy lasts 280 days or 40 weeks from the first day of the last menstrual period. However, it’s important to note that this is just an estimate, and only a small percentage of babies are born on their exact due date. Many babies are born within a week before or after their due date, which is considered normal. The LMP method is a simple and effective way to estimate the due date, especially for women with regular menstrual cycles. It is also used in conjunction with other methods, such as ultrasound, to get a more accurate estimate of the due date. A healthcare provider will typically use the LMP method as a starting point and then use ultrasound to confirm and adjust the due date as needed.
Frequently Asked Questions
What is LMP?
LMP stands for Last Menstrual Period, which is the first day of a woman’s most recent menstrual cycle.
How is the due date calculated using LMP?
The due date is typically calculated as 280 days (40 weeks) from the first day of the LMP.
Is the due date calculated using LMP accurate?
The due date calculated using LMP is an estimate, and only a small percentage of babies are born on their exact due date. Many babies are born within a week before or after their due date.