Period Calculator

Women's Period & Fertility Calculator

Track your cycle, predict ovulation, and understand your fertility window

Calculate Your Cycle

First day of your last period

Average cycle length (days) 21 days 22 days 23 days 24 days 25 days 26 days 27 days 28 days 29 days 30 days 31 days 32 days 33 days 34 days 35 days

Average period length (days) 3 days 4 days 5 days 6 days 7 days 8 days

Next Period

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Fertile Window

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Ovulation Day

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Pregnancy Test Day

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Your Menstrual Cycle

Menstrual

Follicular

Ovulation

Luteal

Menstrual Phase

Follicular Phase

Ovulation

Luteal Phase

Understanding Your Cycle

Menstrual Phase

The menstrual phase is when you have your period. This phase starts on the first day of your period and lasts until the last day of bleeding. During this time, the uterus sheds its lining from the previous cycle.

Follicular Phase

The follicular phase overlaps with the menstrual phase and starts on the first day of your period. During this phase, follicles in the ovaries mature, preparing for ovulation. One follicle will become dominant and release an egg.

Ovulation

Ovulation is when a mature egg is released from the ovary. This typically happens around day 14 of a 28-day cycle. The egg travels down the fallopian tube, where it can be fertilized by sperm. This is your most fertile time.

Luteal Phase

The luteal phase begins after ovulation and lasts until your next period. During this phase, the body produces progesterone to prepare the uterus for a potential pregnancy. If pregnancy doesn't occur, progesterone levels drop, and the cycle begins again.

Disclaimer: This calculator provides estimates based on the information you provide. It is not a substitute for professional medical advice. Always consult with a healthcare provider for personalized guidance regarding your menstrual cycle and reproductive health.