Safe Period Calculator

Enter your first day of last menstrual cycle to make the calculation. Your menstrual periods must be regular and ranging from 26-32 days to use this Modified Safe Period Calculation System.

Do you have a regular menstrual cycle?	Yes    No
Duration of your Last Menstrual Cycle:	26 Days    27 Days 28 Days    29 Days 30 Days    31 Days 32 Days
First day of your last cycle:	JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember 12345678910111213141516171819202122232425262728293031 2011201220132014201520162017