Pregnancy Due Date Calculator
Estimate your baby's due date based on the first day of your last menstrual period.
When Is Your Baby Due?
This calculator provides an estimated due date (EDD) based on the standard method used by doctors worldwide. It works by adding 40 weeks (280 days) to the first day of your last menstrual period (LMP). While only about 5% of babies are born on their exact due date, this estimate provides a crucial timeline for you and your healthcare provider to plan for prenatal care and the baby's arrival.
How to Estimate Your Due Date
Estimating your due date is very simple. You just need one piece of information:
- First Day of Your Last Menstrual Period: Use the calendar to select the date your last period began.
The calculator will instantly display your estimated due date and your current gestational age (how many weeks pregnant you are).
Frequently Asked Questions (FAQ)
Q: How accurate is a due date from my last period?
A: This method, known as Naegele's rule, is an estimate. It assumes a regular 28-day menstrual cycle, which isn't the case for everyone. The most accurate way to determine a due date is through an early ultrasound, which measures the baby's size to establish a more precise gestational age.
Q: What if I have an irregular cycle or don't know my LMP?
A: If you can't recall your LMP or have irregular cycles, this calculator will not be accurate. In that case, your doctor will rely on an ultrasound to determine your due date.