Due Date Calculator
Calculate pregnancy due date with our free Due Date Calculator. Track your pregnancy timeline, get estimated conception date, and monitor trimester progress effectively.
Our Due Date Calculator helps you estimate your pregnancy due date using Naegele's Rule, which calculates based on your last menstrual period. Get insights into your pregnancy timeline, trimester progress, and important milestones throughout your journey.
Leave blank if your cycle is 28 days (the average)
Enter your last period date and click "Calculate Due Date" to see your results
About Due Date Calculations
Due dates are calculated using Naegele's Rule, which estimates the due date by adding 280 days (40 weeks) to the first day of the last menstrual period (LMP). This method assumes a 28-day menstrual cycle with ovulation occurring on day 14.
Naegele's Rule
- • Based on LMP + 280 days
- • Assumes 28-day menstrual cycle
- • Ovulation on day 14
- • 40-week pregnancy calculation
Key Features
- • Trimester tracking
- • Conception date estimation
- • Cycle length adjustments
- • Pregnancy timeline monitoring
This calculator provides estimates only. Your healthcare provider will confirm your due date through ultrasound. Only about 5% of babies are born on their exact due date. Full-term pregnancy is considered 37-42 weeks.