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Calculate mean, median, shortest and longest intervals from recorded period starts.
Choose your units, then enter the details you want to use.
Complete the relevant fields and select Calculate. Changes to your inputs clear the previous result.
Educational estimates, with their equations and assumptions. They do not diagnose a condition or prescribe a treatment.
Adults tracking natural menstrual cycles. Calendar models describe timing rather than fertility status.
Each cycle length is the calendar-day difference between two consecutive recorded starts. Display the arithmetic mean, median, range and next start using the rounded mean. Dates are sorted and duplicates rejected; missing periods cannot be inferred.
