A pregnancy calculator estimates the due date of a pregnancy based on key dates such as the first day of the last menstrual period (LMP), the conception date, IVF transfer date, or ultrasound measurements. The most common method adds 280 days (or 40 weeks) to the first day of the last menstrual period, assuming a 28-day cycle. If the conception date is known, 266 days (or 38 weeks) are added for a more accurate estimate. Ultrasound measurements, especially in the first trimester, can also provide a reliable due date estimate. Pregnancy calculators often allow input of different dates:
- Last Menstrual Period (LMP): Adds 280 days from the first day.
- Conception Date: Adds 266 days.
- IVF Transfer Date: Adds 261 or 263 days depending on the embryo transfer day.
- Ultrasound Date: Uses fetal measurements to estimate gestational age and due date.
These calculations help expectant parents track pregnancy progress and plan prenatal care. If needed, I can assist with calculating a due date based on any of these inputs. Would you like to use a specific date or method for a pregnancy calculation?
