Pregnancy Due Date Calculator
Estimate your due date and track milestones
Calculate your estimated due date based on your last menstrual period, conception date, or IVF transfer date. See which trimester you are in, track key milestones, and count down to delivery.
Most common method — used by most doctors
Disclaimer: This calculator provides estimates for educational and informational purposes only. It does not constitute tax, legal, financial, or medical advice. Results depend on individual circumstances and may not reflect your actual costs. Always consult a qualified professional (CPA, licensed insurance agent, or financial advisor) for decisions about your specific situation. Data reflects approximate 2026 figures from IRS, CMS, and HHS sources.
Understanding Your Due Date
Your estimated due date (EDD) is the date your baby is most likely to arrive, calculated as 40 weeks from the first day of your last menstrual period. This standard method, known as Naegele rule, has been used by healthcare providers for over a century and remains the starting point for prenatal care timing.
However, pregnancy length varies naturally. A normal full-term pregnancy can range from 37 to 42 weeks. Your healthcare provider will monitor your progress and may adjust your due date based on early ultrasound measurements, which can be more precise than LMP-based calculations.
Planning Financially for Baby
Having a baby is one of the largest healthcare expenses many families face. The average cost of a vaginal delivery in the US ranges from $5,000 to $25,000 depending on your insurance and location. A C-section can range from $10,000 to $50,000.
Use our Out-of-Pocket Calculator to estimate your actual delivery costs with insurance. Our HSA Calculator can show you how to save for these costs tax-free, and the FSA Calculator helps you maximize your flexible spending account for prenatal care and delivery.
Sources: WHO, CDC, NIH, American College of Obstetricians and Gynecologists. This calculator is for educational purposes only and is not a substitute for professional medical advice.
Frequently Asked Questions
How is the due date calculated?
The due date is calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP). This assumes a 28-day cycle with ovulation on day 14. If you know your conception date, the due date is 266 days later. For IVF, it is calculated from the transfer date adjusted for embryo age.
How accurate is the due date?
Only about 5% of babies are born on their exact due date. Most babies arrive within two weeks before or after. The due date is an estimate — your healthcare provider may adjust it based on early ultrasound measurements, which are often more accurate than LMP-based calculations.