# 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 9
^{th}day to 18^{th}day from your last period is the unsafe period - The rest is the safe period

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