Track & Predict Menstrual Cycles with Period Calculator
A tool that predicts upcoming menstrual cycle dates based on previous period data, helping track cycles, plan ahead, and identify irregularities in menstrual patterns.
Period Calculator
Track and predict your next period, fertile window, and menstrual cycle phases.
Your Period Calendar
Period Start
Mid Cycle
Next Period
Understanding Your Cycle Phases
Menstrual Phase (Days 1-5)
The phase when the uterine lining is shed, resulting in menstrual bleeding.
Follicular Phase (Days 1-13)
Overlaps with menstruation. Follicles in ovaries develop, one becomes dominant.
Ovulatory Phase (Day 14)
Release of mature egg from ovary. Most fertile time of cycle.
Luteal Phase (Days 15-28)
Post-ovulation phase. Body prepares for possible pregnancy.
Important Notes
- This calculator provides estimates based on average cycles
- Actual cycle length may vary month to month
- Track your periods regularly for more accurate predictions
- Consult healthcare provider for medical concerns
Frequently Asked Questions
A normal menstrual cycle can range from 21 to 35 days, with 28 days being the average. The menstrual period itself usually lasts 3-7 days. However, what's "normal" varies from person to person, and cycles can change throughout your life.
Tracking your period helps you: understand your body's patterns, predict future periods, identify irregular cycles, plan for important events, monitor reproductive health, and prepare for pregnancy or avoid conception. It's also valuable information to share with healthcare providers.
Irregular periods can be caused by: stress, significant weight changes, excessive exercise, hormonal imbalances, PCOS, thyroid disorders, pregnancy, perimenopause, certain medications, and other medical conditions. If your cycles are consistently irregular, consult a healthcare provider.
Period symptoms can be managed through: regular exercise, balanced diet, adequate sleep, stress management, heat therapy for cramps, over-the-counter pain relievers, and staying hydrated. Some find relief through yoga, meditation, or dietary changes. Severe symptoms should be discussed with a healthcare provider.
Cycle length can be influenced by: age, stress, diet, exercise, weight changes, travel, illness, medications, hormonal contraception, and overall health. Environmental factors and significant life changes can also impact your cycle timing.
Consult a healthcare provider if you experience: periods lasting longer than 7 days, severe pain, very heavy bleeding, bleeding between periods, irregular cycles, missed periods, post-menopausal bleeding, or any concerning changes in your cycle pattern.