There are many ways to calculate ovulation, but the most common method is to estimate it by measuring your basal body temperature. Basal body temperature refers to the body temperature measured when you wake up in the morning. It can reflect changes in hormone levels within the body, thereby helping people predict ovulation.

First, you need to measure your basal body temperature. The measurement method is to take your body temperature when you wake up in the morning and record it in a form. Basal body temperature usually lasts for 3-5 days, then begins to decrease and reaches its lowest value on the same day of the next month.

Next, calculate the number corresponding to 5 in the table. This number indicates the date when the basal body temperature is lowest, which is the period of ovulation. Typically, ovulation occurs around this day, but the exact date can vary.

It is important to note that the method of measuring basal body temperature may vary. Some people may experience discomfort, so choose a comfortable time and place to take the measurement. In addition, the time taken to measure basal body temperature may also vary.