Period Calculator
Track your menstrual cycle, predict your next period, and identify your most fertile days. Get personalized insights about your cycle and reproductive health.
Track Your Cycle
Your Cycle Results
Enter your last period date to track your cycle
Understanding Your Menstrual Cycle
The menstrual cycle is a natural process that prepares your body for potential pregnancy. It typically lasts 28 days but can vary from 21 to 35 days. Understanding your cycle helps you track fertility, plan activities, and monitor your reproductive health.
Cycle Phases
Menstrual Phase (Days 1-5)
Your period occurs. The uterine lining sheds, and bleeding lasts 2-7 days on average.
Follicular Phase (Days 6-14)
Your body prepares for ovulation. Follicles develop in the ovaries, and estrogen levels rise.
Ovulation (Day 14)
An egg is released from the ovary. This is your most fertile time for conception.
Luteal Phase (Days 15-28)
After ovulation, your body prepares for pregnancy. If no fertilization occurs, the cycle restarts.
Fertility and Conception
- Fertile Window: 5 days before ovulation + 1 day after (about 6 days total)
- Peak Fertility: 1-2 days before ovulation
- Ovulation Signs: Increased cervical mucus, slight temperature rise, mild cramping
- Conception: Sperm can live up to 5 days in the reproductive tract
When to See a Healthcare Provider
Irregular Cycles
- • Cycles shorter than 21 days
- • Cycles longer than 35 days
- • No period for 3+ months
- • Very heavy or painful periods
Other Concerns
- • Severe PMS symptoms
- • Bleeding between periods
- • Sudden changes in cycle
- • Difficulty conceiving after 1 year
Disclaimer: This calculator provides estimates based on average cycle patterns. Individual cycles can vary significantly. Always consult with a healthcare provider for personalized medical advice, especially if you have irregular cycles or are trying to conceive.
