Period Calculator
Track your menstrual cycle, predict your next period, and identify your fertility window for family planning.
Understanding Menstrual Cycles
The menstrual cycle is typically 28 days but ranges from 21-35 days normally. Key phases: Menstruation (days 1-5): shedding of uterine lining, typically lasts 3-7 days. Follicular Phase (days 1-13): estrogen levels rise, preparing for ovulation. Ovulation (day 14): release of egg, most fertile time, lasts 24 hours. Luteal Phase (days 15-28): progesterone rises, preparing for potential pregnancy. Fertility window: days 5-7 days before ovulation through ovulation day—about 6 days per cycle when pregnancy is possible. Tracking cycle helps predict menstruation, plan activities, and identify fertility if trying to conceive or avoid pregnancy. Regular cycles (21-35 days) are normal; irregular cycles may indicate hormonal imbalances—consult gynecologist if cycles are erratic. Indian women should maintain period hygiene and consult healthcare providers for excessive bleeding, severe cramps, or prolonged cycles. Stress, exercise, diet, and medical conditions can affect cycle regularity.