EDD Calculator | Estimated Due Date

Your Gestational Age:

Understanding Due Date Calculations:

The estimated due date (EDD) is a calculation of when your baby is likely to be born. A full-term pregnancy typically lasts about 280 days (40 weeks) from the first day of your last menstrual period (LMP).

Common Calculation Methods:

• Naegele’s Rule (LMP): The most common method. Add 7 days to the first day of your LMP, then count forward 9 months (or subtract 3 months from LMP month and add 1 year). This assumes a 28-day cycle. Adjustments are made for shorter or longer cycles.
• Conception Date: If you know the exact date of conception, your due date is approximately 266 days from that date.
• Ultrasound: Early ultrasounds (typically in the first trimester) are often considered the most accurate way to confirm or adjust your due date based on fetal measurements.
• IVF/IUI Transfer Date: For assisted reproductive technologies, the transfer date and embryo age (Day 3 or Day 5) or IUI date are used for a more precise calculation.

It’s important to remember that only about 5% of babies are born exactly on their due date. Most babies arrive sometime between 37 and 42 weeks of pregnancy. This calculator provides an estimate, and your healthcare provider will confirm your due date with professional medical assessments.