Duck hunt
Calender based contraceptive methods
Enter first day of Last Menstrual Period:
/
/
(dd/mm/yyyy)
Duration of cycles:-
If cycles are irregular:
Shortest cycle:
days
Longest cycle:
days
If cycles are regular enter same duration in both columns
Rhythm method (Knaus– Ogino method)
Failure rate on perfect use: 9% per year
Standard Days Method
The Standard Days Method may only be used by women whose cycles are usually between 26 and 32 days in length.
Perfect use failure rate: 5% per year
Typical use failure rate: 12% per year
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