Track your menstrual cycle, predict your next period, and identify your fertile window and ovulation day.
The uterine lining sheds. This is when bleeding occurs, typically lasting 3–7 days.
Hormones stimulate egg development in the ovaries. Estrogen rises, thickening the uterine lining.
A mature egg is released. This is the most fertile time — the egg survives ~24 hours.
Progesterone rises to support potential pregnancy. If no implantation occurs, hormone levels drop and the cycle restarts.
⚕️ Disclaimer: This calculator provides estimates based on average cycle data. It is not a substitute for medical advice and should not be used as a contraceptive method. Consult your healthcare provider for personalized guidance.