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Menstrual Cycle Length Calculator

Use this calculator to calculate your shortest, longest, and average menstrual cycle length. Enter just the first day of your last several periods and click calculate to see your menstrual cycle chart.
Today's Date (Dec 29 2014) 
Period start date:
Calculate Your Cycle and instantly see where you are in your cycle today!
How to calculate average menstrual cycle length...
Use MyMonthlyCycles.com FREE Period Tracking Calendar! and your cycle statistics auto-calculate as you track!
  1. Setup your free account at MyMonthlyCycles.
  2. Use the Period Tracker. Click your period dates. Track as many past periods as you want!
  3. Each time you track your period, your cycle statistics are re-calculated!
  4. Use My History (quick history, or menstrual cycle chart) for your cycle summary.
  5. Transport your cycle stats to WhenMyBaby! Click the WhenMyBaby link on MyMonthlyCycles for details.
Free tools for your cycles at MyMonthlyCycles.com!

MyMonthlyCycles period tracker, menstrual cycle chart and more also work on mobile devices!
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All content on this site, including any calculations generated by interactive tools, is for informational and educational purposes only. It is not medical advice, and is not a substitute for medical advice, diagnosis or treatment. See About Our Service.