Safe Days Calculator
This safe days calculator helps you identify the infertile period in a woman’s menstrual cycle when the chances of pregnancy are lowest. By entering the date of the last menstrual period, average cycle length, and menstruation duration, it estimates safe days, fertile days, and ovulation. It can be used both for natural birth control and to plan conception.
Calculate Infertile and Fertile Days in Menstrual Cycle
Safe and Fertile Days Estimation Formula
Fertile window: Ovulation date ± 2 days
Safe days: Before fertile window and after ovulation + 3 days.
The Safe Days Calculator is based on the calendar method and helps in identifying the high and low fertility phases of a woman’s menstrual cycle. It assumes that ovulation happens 14 days before the next period, and the fertile window spans several days around ovulation. By avoiding unprotected intercourse during this window, couples may reduce the risk of unplanned pregnancy. The tool is also helpful for those trying to conceive, by showing the most fertile days. Accuracy depends on cycle regularity.