Safe days to avoid pregnancy

safe period calculatorIn Safe period Calculator© Method, day 1-7 of a regular menstrual period lasting from 26 to 32 days are calculated as infertile or safe; considering the 3-5 day life span of sperm cells in the female reproductive track. Post ovulatory infertility period is calculated based on the fact that; if ovulation occurs on 19th day, fertilization can result until 20th day of the cycle. Since it is a calendar based method, results may vary from women to women.


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Calculate your Safe days online

Enter your first day of last menstrual cycle to make the calculation. Your menstrual periods must be regular for atleast six months and ranging from 26-32 days to use this safe day calculation System.

Do you have a regular menstrual cycle?
Yes    No
Duration of your Last Menstrual Cycle:
26 Days    27 Days 28 Days   
29 Days 30 Days    31 Days
32 Days
First day of your last cycle:

World Health Organization (WHO) data shows that approximately 80% of menstrual cycles ranges from 26 to 32 days, and this safe period calculation system is adjusted to reflect these data.

Who can use Safe Period Calculator?

Who cannot use Safe Period Calculator?


Natural Birth Control Methods

Methods of determining infertile days or Safe days to avoid or delay pregnancy is in use for thousands years as a natural birth control method.

Studies shows that implimenation of modern scientific knowledge along with these calendar based charts will improve the accuracy of safe period calculation methods. The idea behind safe period calculator is to prevent or delay unwanted pregnancy naturally without any side effects. Currently there are a few methods of natural family planning, like less reliable rhythm method and mucus method.

Menstrual cycles have several days at the beginning that are infertile (pre-ovulatory infertility), a period of fertility, and then several days just before the next menstruation that are infertile (post-ovulatory infertility). The first day of bleeding is considered day one of the menstrual cycle. In this safe period calculator, days 1 to 7 and day 21 to rest of the cycle is calculated as "Safe Period" or "safe days" for individuals with regular 26-32 days cycles. Plese read the method overview for more information. Proper use of Safe Period Calculation method along with coitus interruptus (withdrawal method or pull-out method) is a suggested as a sin free or green family planning method for couples with self control over sexuality. Withdrawal method is not suggested for adolescents or those having casual sex. Others may use condoms during unsafe days to avoid serious and potentially life-threatening risks associated with the use of contraceptive pills.

What is a regular period?

Menstrual cycle is regulated by hormones and regular menstrual period occurs every month without any missing periods, depending upon your cycle length. A variation of two to three days between menstrual cycles is normal and for some women, menstrual cycle is repeated almost regularly in every 28 days. Although the period of the menstrual cycle can vary from 21 to 35 days, the average cycle lasts for 28 days.

What is an irregular or abnormal menstrual pattern?

According to American Congress of Obstetricians and Gynecologists (ACOG), menstrual cycles longer than 35 days or shorter than 21 days are abnormal. Menstrual bleeding normally lasts between two and seven days, with the average being five days and periods last for longer than seven days are generally considered as abnormal. Read more

Safe Period Calculator : Method Overview

The menstrual cycle, is commonly divided into three phases: the follicular phase (pre-ovulatory phase), ovulation, and the luteal phase (post-ovulatory phase). The length of each phase varies from woman to woman and cycle to cycle, though the average menstrual cycle is 28 days. Menstrual cycles are counted from the first day of menstrual bleeding.
The follicular phase (or proliferative phase) is the phase of the menstrual cycle; before ovulation, during which follicles in the ovary mature. It ends with ovulation. The main hormone controlling this stage is estradiol.
Ovulation is the process in a female’s menstrual cycle by which a mature ovarian follicle ruptures and discharges an ovum. The time immediately surrounding ovulation is referred to as the ovulatory phase. A woman gets pregnant around the days when ovulation occurs.
The luteal phase (or secretory phase) is the latter phase of the menstrual cycle. It begins with the formation of the corpus luteum and ends in either pregnancy or degradation of the corpus luteum. The corpus luteum is a temporary endocrine structure, involved in production of estrogen and progestogen, which is needed to maintain the endometrium, the inner membrane of the uterus.
The infertility period depends on the life span of sperm and on the life span of the egg. The average time of ovulation is the 14th day of an average length (28 day) menstrual cycle. Ovulation time vary for each individual, and can occur from 12th to 19th day of the cycle. Sperm can live up to 3 to 5 days in a womans reproductive tract, so it is possible to become pregnant if unprotected sex occurs 5 days before ovulation. The life span of the typical egg is relatively short, only around 24 hours. If fertilization does not occur within that time frame, the egg will die.