Gestational Age Calculator

Gestational Age Calculator

Gestational age or the age of the baby refers to the length of pregnancy after the first day of the last menstrual period (LMP) and is usually expressed in weeks and days. This system is very useful and normally used by obstetricians and health care professionals to share estimate due date of pregnancy so patients can plan accordingly.

How to calculate Gestational Age ?

Basically the gestational age calculation is based on the assumption that the average menstrual cycle is 28 days, with ovulation occurring on the 14th day. So, if you know the first day of your last menstrual period, you can easily estimate the gestational age and the due date of pregnancy.

Formula for Gestational Age

To calculate gestational age one must know the date of the last menstrual period, so there is specific formula for calculating the gestational age manually. Starting from the first day of the woman's last menstrual period, doctors can estimate the age of a pregnancy in weeks.

Considerations

One important point to remember is that gestational age might not represent the actual developmental age of baby, especially in early pregnancy when a few days can make a significant difference. So for a more accurate estimation of baby's age, ultrasound scanning is often used and is also considered most accurate way to estimate gestational age.