Menstruation and Period Calculator

First Day of Last Menstrual Period:

Length of Period:

Cycle days:

Menstruation or a period is a monthly bleeding phenomenon that happens when a woman ovulates but does not get pregnant. In this process of menstruation the body sheds its uterine lining –in other words the lining of the womb.

The shedding is in the form of blood and tissue that passes out through a small vent in the cervix and finally comes out through the vagina. The process lasts for 3 to 5 days in a normal individual and the first day is noted as the first day of the menstrual cycle which can last anywhere from 21 to 35 days.

It is important for any woman to know her menstrual cycle and calculate when the next menstrual cycle is set to occur. The menstruation and period calculator on this page will help you do just that. Here is a step by step guide to using this menstruation and period calculator:

Step 1:
Enter the starting date of the last period in the fields provided in the first part of the calculator. Use the drop box to select the relevant month, date and day.

Step 2:
In the next field enter the length of the period using the number keys.

Step 3:
In the last field mention the number of days your cycles last. For this calculate the number of days between the first day of your previous period till the first day of the next period.

Step 4:
In the final step, after you have entered all the fields, hit the calculate button and entire chart of menstrual cycle for a whole year will be displayed.

Interpretation of Results
It gives you complete details of your menstruation cycle right from the expected days of the next period in any given month to the fertile days and the day when ovulation begins. It also gives you additional information on the pregnancy date in case fertilization happens and you miss your next period. Thus this chart is an excellent tool to plan your pregnancy using your menstruation and period dates.