Period Calculator
Use this calculator to estimate the future period days or the most probable ovulation days.
Period Calculator
Track your menstrual cycle and predict ovulation days
Calculate Your Cycle
Your Cycle Forecast
Understanding Your Menstrual Cycle
The menstrual cycle is a series of changes that occur in a woman's body as part of the preparation for the possibility of pregnancy occurring.
Key Facts About Menstrual Cycle
- Typically begins between 12 and 15 years of age and continues until menopause (around age 52)
- The cycle is counted from the first day of one period to the first day of the next
- Controlled by the rise and fall of hormones
- The average menstrual cycle lasts 28 days
- A regular cycle varies by less than 8 days between the longest and shortest cycles
Ovulation and Fertility
Ovulation is when an egg is released from the ovaries, which corresponds with the time during which a woman is most fertile (about 5 days before ovulation, up through 1-2 days after ovulation).
Menstrual Period
A period is the regular discharge of blood and mucosal tissue that occurs as part of the menstrual cycle. It usually lasts between 2 and 7 days.
How This Calculator Works
The Period Calculator estimates period days and the most probable ovulation days in calendar form. Period days are the days during which bleeding and discharge occur. The most probable ovulation days are the days during which a woman is most likely to ovulate.
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