Calculate Your Next Period
Use this tool to calculate your next period. Input the date of your last period in the 'Last period date' field, input the average length of your cycle in days and click 'Calculate' button. Once the calculation is done you will see a summary pie chart that shows the date of your last period, the current date and the day of your cycle. Repeat this calculation as long as necessary.
You can also use our FREE service to keep track of your menstural history. That way you don't have to remember when your last period was because our system stores this information in your account. Additionaly, if you are irregular our system will be able to calculate your average cycle based on your menstrual history and will predict your next period based on this information. Register here and start tracking your periods for FREE! Or read more about our service.