Pregnancy Calculator

This is the most common method for calculating due dates. The calculator will estimate your due date by adding 280 days (40 weeks) to the first day of your last period.

If your menstrual cycle is typically longer or shorter than 28 days, you can adjust this setting for a more accurate due date estimation.

If you know the exact date of conception, you can enter it for an alternative calculation method. The due date will be calculated as 266 days from the conception date.

After clicking "Calculate Due Date," you'll see your estimated due date, how far along you are in your pregnancy, and which trimester you're currently in.

Our calculator provides an estimation based on standard pregnancy calculations. Only about 5% of babies are born on their exact due date, but most are born within two weeks of the estimated date.

This method is used because most people don't know the exact date of conception, but they typically remember the start date of their last period. Pregnancy is calculated from the first day of your last period because that's when your body begins preparing for ovulation.

If you're unsure about the date, try to recall any significant events around that time that might help you remember. If you're still uncertain, an ultrasound scan can provide a more accurate estimation of your due date.

Women with longer cycles tend to ovulate later in their cycle, which may mean the due date needs to be adjusted accordingly. Our calculator accounts for this when you input your average cycle length.