A woman's menstrual cycle is calculated from the first day of menstruation to the first day of the next menstruation. This is considered one menstrual cycle, which generally ranges from 21 to 35 days. Each person's physical condition is different, so the duration of the menstrual cycle may vary. Generally, menstruation that comes early or late for a week is considered normal.

How to Calculate the Menstrual Cycle

The menstrual cycle is calculated from the first day of the current menstruation to the first day of the next menstruation. The calculation of the menstrual cycle should include the time of menstruation. For example, if the first day of the most recent menstruation was September 31st, and the first day of the previous menstruation was September 1st, subtracting the two dates will give a number of 30, representing a menstrual cycle of 30 days. Typically, a woman's menstrual cycle lasts between 28 and 32 days. However, due to individual differences, the length of the menstrual cycle can vary from person to person. A menstrual cycle that is a week earlier or later can still be considered normal if it maintains a certain regularity. When visiting a gynecologist, many women are often asked about the date of their last menstruation. The last menstruation refers to the most recent menstrual period before the consultation date and should be calculated from the first day of bleeding.

What is Considered a Normal Amount of Menstrual Flow

Menstruation allows women to better regulate their bodies and eliminate toxins. What is considered a normal amount of menstrual flow? Under normal conditions, a girl's menstruation generally lasts for about 5 days. The first two days usually have the heaviest flow, and the flow will gradually decrease day by day in the following days.