Woman finally fulfills her desire to have children

Fertility Calculator - Calculate your fertile days now

23. SEPTEMBER 2022


A pregnancy only occurs if the fertilization and implantation of an egg cell by the sperm has been successful. If you want to have children, it is therefore important and helpful to know your fertile days. 

Note: This calculator cannot be used as a method of birth control.


Before it begins:
Enter the first day of your last period and how many days your cycle has. If the length of your cycle is not always the same, calculate an average value based on the last three months.

Name Reserve

fertile days

First day of your period

implantation of the ovum

blood test possible

First day of your period

fertile days

implantation of the ovum

blood test possible


How the fertility calculator works

The calculator uses your period and cycle length to determine your fertility. The time when the chance of conception is highest. For the calculation, you enter both the first day of your last menstrual period and the length of your cycle in the calendar. This is the number of days between the first day of your last menstrual period and the first day of your next menstrual period. The ovulation calculator not only shows you the day of your ovulation, but also the fertile days around.

The fertility calculator has limited reliability. Rather, these are approximate values. Your age, your diet, your health, how much exercise you do and stress can affect your cycle. An irregular cycle is normal to some extent. Fluctuations between +/- 5 days occur in many women.


How many days after your period are you fertile? 

Aside from the day you ovulate, there are 4 to 5 other days when you may have a better chance of conceiving. These are not only after, but also before ovulation. If you count from the first day (inclusive) of your menstrual period, the eleventh to fourteenth day after that the desire to become a parent is most likely.

When is the chance of getting pregnant the highest?

Pregnancy can occur when, after sexual intercourse, a man's sperm meets an egg capable of being fertilized. This is only 12 to 24 hours after ovulation. Sperm cells can survive in the female body for up to 5 days. The hope of having a child is therefore highest two days before to one day after ovulation.

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