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    Period Calculator

    menstrual calendar

    Please select the first day of your last menstrual period:


    Usual number of days in your period:

    Using a period calculator

    The period calculator requires you to input is the date of your last menstrual period. The reference to the last date means the starting date of the last cycle and not the ending date.

    The second input that the period calculator requires is to provide the average length of time between your periods. Since this varies from person-to-person, it is best not to assume this number – This helps in predicting the upcoming dates as accurately as possible. And it is essential that this number be as accurate as possible since it will help you determine your most fertile days if you are planning a new addition to the family.

    Once you have shared these inputs, the period calculator shares the result with you. It provides you the dates of your next menstrual period as well as your most fertile days. Please bear in mind that these calculations are not 100% accurate since there are several factors that influence a period.

    P.S.: For those of us who are curious, it also shares an estimated due date should you conceive within the given fertile days.. Happy planning!

    P.S.: For those of us who are curious, it also shares an estimated due date should you conceive within the given fertile days.. Happy planning!

    Benefits of period calculator

    A period calculator helps you in the following ways:

    How to prevent irregular periods

    What is an abnormal period?

    An average menstrual cycle is 28 days long but anything between 21 to 35 days is considered normal. Menstrual cycles depend on the woman’s body and several other factors like diet, lifestyle, etc. Generally, girls start their period between the age of 10-16 years and it takes them up to a year to have regular cycles.

    Problems in a menstrual indicate abnormal periods. The problems could be anything ranging from short or long duration, heavy or very light flow, spotting or bleeding before the menstrual cycle, missed periods, etc. There are also other period related problems such as nausea, severe abdominal pain, fever, dysentery, menstrual cramps, hot flushes, weakness, low blood pressure, etc.

    Amenorrhea is a condition wherein a women’s period cease completely. If the menstrual period is absent for 90 days then it is considered as abnormal. Normally menstrual period stops when a woman is pregnant or breastfeeding or when she is going through menopause. Hence it is essential to keep a tab of your menstrual cycles.

    How can you make your period normal?

    Abnormal periods are the result of several causes – one of which is stress. Changes in lifestyle, routine, travel, gaining or losing weight are some of the key factors that show on a woman’s menstrual health. Some of the other contributors are fibroids, polycystic ovaries, pelvic inflammatory diseases, hormonal imbalances, etc.

    The key to fixing abnormal period lies in addressing hormonal imbalances. Consuming nutritious food not just during the periods but throughout the entire year will start restoring one’s health and hormonal imbalance gradually. The other essential factor to address abnormal periods is getting adequate rest. In today’s fast paced world, the body’s rest and relaxation is what takes the maximum hit – It is important to address this and not over- do anything in order to restore one’s body balance.

    Menstrual Cycles

    On an average a menstrual cycle falls between 28 and 32 days. This varies due to multiple factors and results in a variation in the ovulation cycle as well. A typical cycle looks something like this –

    Day 1

    Your cycle begins on the first day of blood flow.

    Days 2-14

    The follicles on the ovary become active, and the cervical mucus starts to thin.

    Day 14

    Ovulation occurs mid-cycle, but can vary from between Day 11 and Day 21 of a woman's cycle. Rising estrogen levels trigger the LH surge, which causes the follicle to ovulate and release an egg. It's important to chart the basal body temperature and LH surge so you know when you ovulate.

    Days 15-22

    After releasing the egg, the follicle produces progesterone, which thickens the lining of the uterus for implantation.

    Days 23 to 24

    Implantation of a fertilized egg can take place. At this point, hormones produced by pregnancy may be detected by a pregnancy test.

    Days 25 to 28

    If pregnancy does not occur, the hormone levels begin to fall. The uterine lining sheds, resulting in the menstrual period.

    Ovulating Days

    Ovulation occurs between 12 and 14 days (on an average) before the menstrual period starts. To calculate the length of your average menstrual cycle make a note of the date of the first day of two consecutive menstrual cycles – The difference between the two dates is the average duration of your menstrual cycle. Ovulation occurs about two weeks before the next expected period. These are considered the most fertile days for a woman if you trying to get pregnant.