How to Use the Due Date Calculator
This calculator helps you estimate your pregnancy timeline based on standard medical calculations.
- 1. Enter Your Last Menstrual Period (LMP): Use the date picker to select the first day of your last period. This is the most common starting point for calculating a due date.
- 2. See Your Results Instantly: The calculator immediately provides your estimated due date, your current gestational age (how many weeks pregnant you are), and other key milestone dates for your pregnancy journey.
Frequently Asked Questions
How is the due date calculated?
This calculator uses Naegele's rule, which is a standard method for calculating an estimated due date. It adds 280 days (or 40 weeks) to the first day of your last menstrual period (LMP). This method assumes a regular 28-day menstrual cycle.
How accurate is this calculator?
This tool provides an estimate, not a definitive date. A full-term pregnancy can naturally range from 38 to 42 weeks, and only a small percentage of babies are born on their exact due date. An ultrasound is the most accurate way to determine gestational age. Always consult with a healthcare provider for medical advice and a more precise timeline.
What are the trimesters?
A pregnancy is divided into three trimesters:
- First Trimester: Week 1 through the end of Week 13.
- Second Trimester: Week 14 through the end of Week 27.
- Third Trimester: Week 28 until birth.
Important Medical Disclaimer
The information and calculations provided by this tool are for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or your pregnancy.