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This is typically the first day of your last period
A Pregnancy Calculator is a tool used to estimate your baby's due date and track your progress through the 40 weeks of pregnancy. Most medical professionals calculate the length of a pregnancy as 280 days (40 weeks) starting from the first day of your last menstrual period (LMP).
Our calculator allows you to find your due date using three different methods: your Last Period, your Conception Date, or by working backward from a Known Due Date.
Pregnancy is traditionally divided into three stages, each with its own unique developmental milestones:
It is important to remember that a due date is an estimate. In fact, only about 5% of babies are born exactly on their due date. Most babies arrive between 37 and 42 weeks of pregnancy.
Factors that can influence your actual delivery date include the length of your menstrual cycle, the accuracy of your LMP date, and individual variations in fetal development.
If your cycle is significantly longer or shorter than the average 28 days, the LMP method might be slightly off. In such cases, an early ultrasound (dating scan) is the most accurate way to determine your due date.
Conception typically occurs about 14 days after the first day of your last period. If you know the exact date of conception, our calculator can provide a more tailored timeline.
You should schedule your first prenatal appointment as soon as you receive a positive pregnancy test. Early care is vital for the health of both the mother and the baby.