Pregnancy Calculator
Calculate your due date (EDD) and gestational weeks
Pregnancy Calculator - Due Date & Gestational Weeks Online Free | DailyHub
Calculate your gestational weeks and estimated due date (EDD) from your last menstrual period using Naegele's rule — the standard method used by obstetricians worldwide.
Disclaimer: This calculator is for informational purposes only. Consult a doctor for a professional assessment of your health.
Enter the first day of your last menstrual period
How It Works
- Enter the first day of your last menstrual period (LMP)
- Click 'Calculate'
- See your estimated due date
- Check current gestational weeks and trimester
- View the countdown to your due date and the progress bar
Frequently Asked Questions
What is Naegele's Rule?
Naegele's Rule calculates the estimated due date by adding 280 days (40 weeks) to the date of the last menstrual period. It has been the standard method in obstetrics and gynaecology since 1812.
Is the calculation accurate?
Naegele's Rule provides a reliable estimate for regular 28-day cycles. Only about 5% of babies are born on their exact due date. A first-trimester ultrasound remains the most accurate dating method.
What does EDD mean?
EDD stands for Estimated Due Date. It is the estimated date of delivery, calculated at 40 weeks from the start of the last menstrual period. A birth is considered full term between 37 and 42 weeks.