Period Calculator

Track menstrual cycle, predict periods, and monitor cycle health.

Period Calculator

About the Period Calculator

The Period Calculator helps you track your menstrual cycle, predict your next period, and monitor your cycle health. Enter your last period date and cycle information to get predictions for upcoming periods and ovulation dates. Use it for: - Predicting next period dates - Tracking cycle length and patterns - Monitoring cycle health - Planning around your menstrual cycle Menstrual Cycle Basics: - Cycle Length: Typically 21-35 days (average: 28 days) - Period Duration: Usually 3-7 days - Ovulation: Approximately 14 days before next period - Fertile Window: 5 days before ovulation through ovulation day Tracking Tips: - Track for at least 3-6 months to identify patterns - Note any symptoms, flow intensity, and cycle variations - Irregular cycles may indicate health issues - consult a healthcare provider if concerned This calculator provides estimates based on average cycle patterns. Individual cycles vary, and many factors can affect cycle timing.

Who Should Use This Period Calculator?

  • Women tracking regular or irregular menstrual cycles
  • Those planning travel, events, or daily routines
  • Anyone wanting to understand ovulation timing
  • Teens learning about menstrual cycle patterns

Frequently Asked Questions

Your next period is typically your cycle length (usually 21-35 days) from the first day of your last period. Track several cycles to determine your average cycle length.
A normal menstrual cycle is typically 21-35 days, with the average being 28 days. Cycle length can vary month to month, and it's normal to have some variation.
Irregular cycles (varying more than 7-9 days) can be normal, especially in teens and perimenopause. If you're concerned about irregular cycles, consult a healthcare provider.

Medical Disclaimer: This calculator provides estimates based on average cycle patterns. Individual cycles vary significantly. If you experience irregular cycles, severe pain, or other concerns, consult with a healthcare provider for personalized medical advice.