Pregnancy Due Date Predictor
Plan for your baby's arrival. This predictor uses Naegele's rule alongside custom cycle lengths to calculate your due date, current gestational age, and key pregnancy milestones.
1Step-by-Step User Instructions
- Input the start date of your Last Menstrual Period (LMP).
- Adjust the slider to your average cycle length (defaults to 28 days).
- Click 'Calculate Due Date'.
- Read your estimated due date, current gestational week, and exciting timeline milestones.
2Applications & Structural Benefits
- Easy Milestone Tracking: Highlights key embryonic and diagnostic milestones throughout your pregnancy.
- Custom Cycle Adjustments: Adapts calculations to match your natural cycle length for more accurate dates.
- Informative Timeline Insights: Lists estimated trimester dates to help you prepare for baby's arrival.
Naegele's Standard Calendrical Model
Explore details outlining algorithmic capabilities, mathematical frameworks, security standards, and operational questions.
How accurate are estimated due dates?
Only about 4% of babies are born on their exact due date, but the estimate serves as a highly reliable milestone tracker.
What is Naegele's rule?
It is the standard clinical formula used by obstetricians to calculate due dates based on lmp dates.
Does cycle variations change due dates?
Yes, our cycle length slider adjusts calculated dates to match your natural cycle perfectly.
How many weeks does a typical pregnancy last?
Normal pregnancies last approximately 40 weeks (280 days) from the start of the last period.
What is gestational age?
It measures the age of the pregnancy in weeks, calculated from the start of your last menstrual period.
Can I use this for IVF pregnancies?
IVF pregnancies calculate dates using transfer dates, but lmp estimates remain highly useful reference points.
How are trimesters split?
Trimester 1 spans weeks 1-13; Trimester 2 spans weeks 14-27; and Trimester 3 spans week 28 up to birth.
Where is my calendar date logged?
We prioritize your privacy. No health data is uploaded; everything is computed completely client-side in your browser.