Period Calculator

Planning a vacation, special occasion, or just your work-week wardrobe and want to factor in forthcoming periods? Simple with the period calendar: Calculate your period calendar based on your menstrual tracker history, or run Quick Calculate, to forecast your future periods. Also check if your period is late!

Step 1. Select Calculation Rule

Your upcoming periods will be calculated based on your last period and average cycle length, as determined by your tracking history.

My period usually lasts days

To use this option, you need to be logged in.


Your upcoming periods are calculated using the data specified below.

My last period started:
I get my period every days
My period usually lasts days

Step 2. Select Display Options

Size and design only apply to Calendar display type.

For printing your menstrual calendar on non-color printers, use the classic designs which use images for period days.