Safe Days Calculator

How to Calculate the Longest & Shortest Menstrual Cycle?

How to Calculate the Safe and Unsafe Days?

• Note down the shortest menstrual cycle from the last six months, and subtract 18 days from the total number of days of shortest cycle.
• The number of days that you get after subtracting 18 days, count that number of days from the first day of your last period and mark it as X. X is the first day of the fertile period which is unsafe period.
• Next, note down the longest menstrual cycle from the last six months, and subtract 10 days from the total number of days of longest cycle.
• The number of days you get after subtracting 10 days, count that number of days from the first day of your last period and mark it as Y. The days after Y is the safe period.
• So, the days between X and Y are unsafe days to have sex, as there are chances of getting pregnant. All other days apart from these are considered as safe days.