📅Menstrual Cycle Calendar
Track your menstrual cycle, predict periods, ovulation, and fertile windows. Get personalized insights about your cycle phases and symptoms.
Cycle Information
First day of your last menstrual period
Average: 21-35 days
Average: 3-7 days
Cycle Phases:
Your Cycle Status
Enter your last period date to track your cycle
Understanding Your Menstrual Cycle
🔴 Menstrual Phase (Days 1-5)
• Menstrual flow occurs
• Hormone levels drop
• Energy may be lower
• Good time for rest and reflection
🌱 Follicular Phase (Days 1-13)
• Estrogen levels rise
• Energy and mood improve
• Good time for new projects
• Skin often clearer
💜 Ovulation (Around Day 14)
• Egg is released from ovary
• Peak fertility window
• Increased libido
• Cervical mucus changes
🌙 Luteal Phase (Days 15-28)
• Progesterone dominates
• PMS symptoms may occur
• Good time for detail work
• Focus on self-care
Frequently Asked Questions
📅 What is a normal menstrual cycle?
A normal cycle ranges from 21-35 days, with periods lasting 3-7 days. Cycles can vary by a few days month to month.
🤰 When am I most fertile?
You”re most fertile during the 6-day window ending on ovulation day. This includes 5 days before ovulation and the ovulation day itself.
📊 How accurate are cycle predictions?
Predictions are estimates based on your average cycle. Track for 3+ months for better accuracy. Stress, illness, and lifestyle changes can affect timing.
⚠️ When should I see a doctor?
Consult a healthcare provider for cycles shorter than 21 days, longer than 35 days, severe pain, or significant changes in your pattern.
How to Use This Calculator
Getting started with the Menstrual Cycle Calendar takes just a few steps:
- Enter your last period start date -- Select the first day of your most recent menstrual period. This is the day bleeding began.
- Choose your cycle length -- Select the average number of days from the first day of one period to the first day of the next. Normal cycles range from 21 to 35 days.
- Choose your period length -- Select how many days your period typically lasts, usually between 3 and 7 days.
- Mark irregular cycles if applicable -- Check the box if your cycle length varies significantly and select the degree of variation.
- Review your results -- The calculator instantly displays your current cycle day, current phase, next period and ovulation dates, your fertile window, and predictions for the next three months.
Understanding the Menstrual Cycle
Menstrual Phase (Days 1-5)
The cycle begins on the first day of menstrual bleeding. During this phase the uterine lining, which thickened during the previous cycle, is shed through the cervix and vagina. Hormone levels -- particularly estrogen and progesterone -- are at their lowest, which can cause fatigue, cramping, and mood changes. Period length typically ranges from 3 to 7 days. Maintaining hydration, gentle exercise, and adequate rest can help manage discomfort during this phase.
Follicular Phase (Days 1-13)
The follicular phase overlaps with menstruation and continues until ovulation. The pituitary gland releases follicle-stimulating hormone (FSH), prompting the ovaries to develop several follicles, each containing an immature egg. One dominant follicle eventually matures. Rising estrogen levels trigger the uterine lining to thicken again. Many women experience increased energy, improved mood, and clearer skin during this phase as estrogen climbs.
Ovulation (Around Day 14)
Ovulation occurs when a surge of luteinizing hormone (LH) causes the dominant follicle to release a mature egg into the fallopian tube. This typically happens around day 14 of a 28-day cycle, but the exact timing varies based on cycle length and individual factors. The egg remains viable for 12 to 24 hours. Signs of ovulation can include a slight rise in basal body temperature, changes in cervical mucus, and mild pelvic discomfort known as mittelschmerz.
Luteal Phase (Days 15-28)
After ovulation the empty follicle transforms into the corpus luteum and begins producing progesterone. This hormone maintains the uterine lining in preparation for a potential pregnancy. If the egg is not fertilized, the corpus luteum breaks down, progesterone drops, and the lining is shed -- starting the next period. The luteal phase is relatively consistent at 12 to 14 days. Premenstrual syndrome (PMS) symptoms like bloating, breast tenderness, and mood swings are common during this time.
Benefits of Tracking Your Cycle
Regularly monitoring your menstrual cycle helps you anticipate your period, identify your most fertile days, and detect irregularities early. Tracking can reveal patterns that help manage PMS symptoms, optimize exercise routines, and plan around energy fluctuations. It also provides valuable data to share with your healthcare provider if you have concerns about cycle regularity, fertility, or hormonal health.
Typical Cycle Length Reference
| Cycle Length | Classification | Estimated Ovulation Day |
|---|---|---|
| Under 21 days | Short -- consult a doctor | Varies |
| 21 - 24 days | Short but normal | Day 7 - 10 |
| 25 - 30 days | Average / Normal | Day 11 - 16 |
| 31 - 35 days | Long but normal | Day 17 - 21 |
| Over 35 days | Long -- consult a doctor | Varies |
Important Disclaimer
This menstrual cycle calculator provides estimates based on the information you enter and standard cycle assumptions. Actual ovulation and period dates can vary due to stress, illness, hormonal fluctuations, and other factors. This tool is not a substitute for professional medical advice and should not be used as a sole method of contraception or fertility planning. If you experience irregular cycles, severe pain, or other concerns, please consult a qualified healthcare provider.