Pregnancy Due Date Calculator
Choose a method below. Most due date tools are based on 40 weeks (280 days) from LMP, adjusted for cycle length, or other clinical inputs (ultrasound/IVF).
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LMP: —
How the Pregnancy Due Date Calculator Works
This pregnancy due date calculator helps estimate your expected delivery date (EDD) based on medically accepted pregnancy dating methods. Most healthcare providers calculate pregnancy length as approximately 40 weeks from the first day of your last menstrual period (LMP).
By entering your last menstrual period and average cycle length, this calculator estimates how many weeks pregnant you are today and your approximate due date. The results are instant, private, and require no sign-up.
Methods Used to Calculate Due Date
- LMP + cycle length: The most common method used by doctors and midwives.
- Ultrasound gestational age: Early ultrasounds can refine due date estimates.
- IVF pregnancy dating: Based on embryo transfer day (day 3, 5, or 6).
Is the Due Date Exact?
A pregnancy due date is an estimate, not a guarantee. Only about 5% of babies are born on their exact due date. Most deliveries occur within two weeks before or after the estimated date.
Why Pregnancy Weeks Matter
Knowing how many weeks pregnant you are helps track fetal development, schedule prenatal tests, and understand trimester milestones. Use the week-by-week pregnancy guide to follow your baby’s growth throughout pregnancy.
Helpful Pregnancy Resources
Medical Disclaimer
This pregnancy calculator is for educational purposes only and should not replace professional medical advice. Always consult your doctor, midwife, or healthcare provider for accurate pregnancy dating and medical decisions.