Menstrual Period Planning Calculator

Have an important date on your calendar - vacation, party, first date, biz travel - and want to know if your period will be coming along? Forecast with this handy calculator! But remember, this is a prediction based on your past menstrual cycles: future cycles can and do deviate.

Member, but not logged in? Simply login and your tracking history will fill in the last period and average cycle length fields below!

Will I have my period then?

New to MyMonthlyCycles? Try our free Menstrual Calculator (requires login), which forecasts your future periods (up to 18 months in advance) and can show if your period is late.