About Cycle Length
Cycle length is measured from the first day of a period to the first day of the next one. While 28 days is often cited as “average,” normal cycles can vary widely.
How This Calculator Works
Enter multiple past cycle lengths. The calculator averages them, identifies the shortest and longest cycles, and evaluates how consistent your cycle pattern is.
Understanding Your Results
A small difference between shortest and longest cycles usually indicates a more regular cycle. Larger variation may be influenced by stress, travel, illness, or lifestyle changes.
Advice & FAQs
How many cycles should I enter? At least 3 for better accuracy.
Is variation normal? Yes, small changes are common.
Should I track monthly? Regular tracking improves insight over time.
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