Due Date Calculator
Calculate your pregnancy due date and track important milestones
Pregnancy Information
Typical range: 21-35 days
Pregnancy Timeline
Enter your pregnancy information and click "Calculate Due Date" to see your results
Estimated Due Date
Current Status
Important Dates
When to Use Due Date Calculator
First Prenatal Visit
Calculate your due date before your first doctor's appointment to help healthcare providers plan appropriate prenatal care and testing schedules.
Baby Shower Planning
Plan your baby shower 6-8 weeks before your due date to ensure you're comfortable attending and have time to organize gifts before arrival.
Maternity Leave Planning
Use your due date to plan maternity leave start dates, work handovers, and discuss coverage arrangements with your employer well in advance.
Hospital Bag Preparation
Prepare your hospital bag around 35-36 weeks based on your due date calculation, ensuring you're ready for early arrival or scheduled delivery.
Pregnancy Tracking
Monitor your pregnancy progress week by week, track important milestones, and understand which trimester you're in for optimal prenatal care.
Financial Planning
Plan your finances around your due date for medical expenses, baby supplies, childcare costs, and potential income changes during parental leave.
Frequently Asked Questions
What is a due date calculator?
A due date calculator estimates your expected delivery date (EDD) based on pregnancy information like your last menstrual period, conception date, or ultrasound measurements. It helps healthcare providers and expectant parents plan for pregnancy care and delivery.
How accurate is the due date calculation?
Due date calculations are estimates, not exact predictions. Only about 5% of babies are born on their exact due date. Most healthy pregnancies last between 37-42 weeks, with 40 weeks being the average used for calculations. Your actual delivery may occur 2-3 weeks before or after your estimated due date.
What is the difference between LMP and conception date calculations?
LMP (Last Menstrual Period) adds 280 days from your last period's first day, while conception date adds 266 days from the actual conception. LMP is more commonly used as it's easier to remember, but conception date can be more accurate if you know the exact date when fertilization occurred.
Can I use this calculator if I have irregular periods?
Yes, our calculator allows you to adjust your average cycle length for more accurate results. However, if you have very irregular periods (varying by more than 7 days), ultrasound dating might provide more accurate results than LMP-based calculations. Consult your healthcare provider for the most reliable dating method.
What is Naegele's rule?
Naegele's rule is the most common method for calculating due dates, developed by German obstetrician Franz Naegele. It assumes a 280-day pregnancy (40 weeks) from the first day of your last menstrual period, based on a 28-day menstrual cycle with ovulation occurring on day 14.
Is this due date calculator free to use?
Yes, our due date calculator is completely free to use. You can calculate your due date, track gestational age, view pregnancy timelines, and download results without any cost or registration required. We provide this tool as a helpful resource for expectant parents.
Should I rely solely on this calculator for medical decisions?
No, this calculator is for informational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for medical decisions, pregnancy care planning, and accurate dating confirmation through professional ultrasounds and examinations.
When should I see a healthcare provider after calculating my due date?
Schedule your first prenatal appointment as soon as possible after confirming pregnancy, ideally by 8-10 weeks of pregnancy. Early prenatal care is crucial for monitoring your health and your baby's development, regardless of your calculated due date.
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