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How is the Average Length of a Menstrual Cycle calculated?

The average length of a menstrual cycle (periods) is calculated by entering the date of the first day of your last menstrual period (LMP). This is done after a close observation of your menstrual periods. The LMP of every month is counted, and thus, you arrive at the average length of a menstrual period cycle.

1. Ovulation Day:

Ovulation usually occurs 12 to 14 days before the next menstrual period starts. If the cycle is 28 days long, ovulation will occur at day 14 of the menstrual cycle.

Ovulation Day = Cycle Length − 14

2. Fertile Window:

The fertile window is the time in the cycle when pregnancy is most likely to happen.

Fertile Window = Ovulation Day − 5 to Ovulation Day + 1

3. Next Period:

The next period is expected about one cycle length after the last period started (date started).

Next Period Date = LMP Date + Cycle Length

Note: The calendar method is effective if your menstrual cycle is regular. If your cycles are irregular, the accuracy may be reduced, and there is a chance that your ovulation day can shift each month.

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Trying to conceive?

Then, you are at the right place! Our Fertility Calculator will help you discover the most fertile days of your menstrual cycle. It helps you determine the best time to get pregnant. Sexual intercourse during the fertility window in your menstrual cycle will increase the chances of getting pregnant quickly.

This tool provides you with the "Estimated Fertility Window" by just feeding the first day of your Last Menstrual Period (LMP).

Fertility (or) Ovulation Period Calculator