Safe Period Calculator

How to calculate safe period / fertile period

Calculating your fertile / infertile (safe) period is simple. Follow the steps given below
  • Find the last period start date
  • Find out shortest and longest period cycles by observing your period cycles for atleast 6 months
  • Illustrative example of calculating fertile period
    • shortest cycle=27 days
    • longest cycle=28 days
    • Subtract 18 days from the shortest cycle 27-18=9 days
    • Subtract 10 days from the longest cycle 28-10=18 days
    • The 9th day to 18 th day from your last period is the unsafe period
    • The rest is the safe period
The above mentioned method is used to calculate your safe period in our application