Menstrual Period Calculator

If your making plans and want to factor in if you're likely to get your period, or check if you period might be late, use the MyMonthlyCycles Period Calculator, which forecasts your next menstrual cycle(s) based on the start date of your last period and your average menstrual cycle length.

Want to check if your period may collide with a date you're planning? Use our period planner calculator. And, if you've already ovulated during this cycle, use the Next Period calculator, which can very precisely project the start date of your next period.

All of these period calculators are available from the MyMonthlyCycles Calculators page.