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Period Calculator

Predict your next period and ovulation dates. Track your menstrual cycle for health or planning.

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Stay in Sync with Your Cycle

Never be caught off guard again! Our Period Calculator predicts the start dates of your next several menstrual cycles based on your history. By inputting your last period date and average cycle length, you can plan vacations, events, and workouts around your body's natural rhythm. It's a simple, privacy-focused way to maintain awareness of your reproductive health.

Ovulation and Fertility Tracking

Beyond just the bleeding phase, this tool highlights your estimated ovulation window. Whether you're trying to conceive or avoiding pregnancy (using fertility awareness), knowing when you're most fertile is empowering. This calculator visualizes the entire month, helping you understand the hormonal phases—follicular, ovulation, and luteal—that influence your energy and mood.

Health Fact: The average cycle is 28 days, but anything from 21 to 35 days is considered "regular" for adults! Teenagers often have more variability as their systems mature.

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