Free Period Tracker
Log your cycle, predict your next period, and understand your menstrual patterns — all in one place
📅 Period Tracker
Predict your next 3 periods, fertile days & cycle phase
🌙 Where You Are Now
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🔮 Your Next 3 Periods
Your Cycle Calendar
How the Period Tracker Works
Your menstrual cycle is counted from the first day of one period to the first day of the next. By entering your last period start date and average cycle length, this tracker projects your next three periods, estimates your ovulation and fertile window, and tells you which phase of your cycle you're in right now.
Understanding Your Cycle Length
A "normal" cycle can range anywhere from 21 to 35 days — there's no single right number. What matters most is consistency. Tracking a few cycles helps you learn your personal pattern and spot any changes early.
| Cycle Length | What It Usually Means |
|---|---|
| 21–35 days | Considered within the normal range |
| Under 21 days | Short cycles — worth mentioning to your doctor |
| Over 35 days | Long/infrequent cycles — may warrant a check-up |
| Varies >7–9 days | Irregular — common, but track and discuss if persistent |
The 4 Phases of Your Cycle
- 🩸 Menstrual (Days 1–5): Your period — the uterine lining sheds. Energy is often lowest.
- 🌱 Follicular (Days 1–13): Estrogen rises, energy and mood climb, follicles mature.
- 🥚 Ovulation (~Day 14): An egg is released — your most fertile point.
- 🌙 Luteal (Days 15–28): Progesterone rises; PMS symptoms may appear in the last week.
Common PMS Symptoms to Track
- 💗 Mood swings, irritability or anxiety
- 🤕 Bloating, cramps and breast tenderness
- 😴 Fatigue and trouble sleeping
- 🍫 Food cravings and appetite changes
- 🤯 Headaches and difficulty concentrating
When to See a Doctor
- Periods that suddenly become very irregular
- Bleeding that's unusually heavy or lasts longer than 7 days
- Cycles shorter than 21 or longer than 35 days regularly
- Severe pain that interferes with daily life
- Missed periods when you're not pregnant
Frequently Asked Questions
Try Our Other Free Tools
Understanding Your Menstrual Cycle
The four phases of your cycle
Your cycle has four phases — menstruation, the follicular phase, ovulation, and the luteal phase. Understanding each phase helps you predict your mood, energy levels, and fertility throughout the month.
What is a normal cycle length?
A normal menstrual cycle ranges from 21 to 35 days. The average is 28 days, but this varies widely between women and can even change month to month due to stress, diet, exercise, or illness.
Signs of an irregular cycle
Cycles shorter than 21 days or longer than 35 days, very heavy or very light bleeding, periods lasting more than 7 days, or skipped periods can indicate hormonal imbalances. Talk to your doctor if this applies to you.
Tips for accurate tracking
Track for at least 3 months to find your true average cycle length. Note the first day of bleeding each month, any symptoms you experience, and how long your period lasts. The more data you have, the more accurate your predictions become.