Dr Christos T. Pappas
MD, PhD, MSc, BSCCP
How to use the pregnancy calculator?
Enter the date of the first day of your last period and the number of days of your cycle duration. Press the 'Calculate' button.
The other calculations are optional; use them if needed. On average, a cycle can last from 22 to 44 days. The pregnancy calculator takes your cycle length into account when estimating your due date and your probable conception date.