Use this period calculator to easily track your menstrual cycle and predict your next periods.

## Period Calculator

### How to Use the Period Calculator

Select the first day of your last menstrual period and enter your average cycle length in days. After entering these details, click on “Calculate”. The calculator will then display the estimated start date of your next menstrual period.

### How It Calculates Results

The calculator simply adds your average cycle length to the start date of your last period to predict the start date of your next period. For example, if your last period started on the 1st of the month and your cycle is typically 28 days long, the calculator will predict that your next period will start around the 29th of the same month.

### Calculator Limitations

This calculator assumes that your menstrual cycle is regular and that the length of your cycle remains consistent. Cycle lengths can vary from 14 to 45 days, which should be considered when using the calculator. It is not accurate for women with irregular cycles. If you have concerns about your period or cycle length, it is recommended to consult with a healthcare provider.