Period Tracker & Next Period Date Calculator 2025
Track your menstrual cycle and predict your next period date. Calculate ovulation, fertile window, cycle phases, and PMS dates with our free period tracker.
How to Track Your Menstrual Cycle
Tracking your menstrual cycle is an important part of women's health. It helps you understand your body, predict when your next period will arrive, identify your fertile window for family planning, and manage PMS symptoms.
What is a Menstrual Cycle?
A menstrual cycle is the monthly process your body goes through to prepare for pregnancy. It typically lasts 21-35 days, with an average of 28 days. The cycle begins on the first day of your period and ends the day before your next period starts. During this time, hormone levels fluctuate, causing physical and emotional changes.
Ovulation and Fertility
Ovulation is when your ovary releases an egg, typically occurring around day 14 of a 28-day cycle. Your fertile window is about 5 days before ovulation and the day of ovulation itself (days 10-15 for a 28-day cycle). During this window, you have the highest chance of getting pregnant if you're trying to conceive, or when you should use protection if you're not.
The Four Cycle Phases
Menstrual Phase (Days 1-5): Your period. Hormone levels are low.
Follicular Phase (Days 1-13): Estrogen rises. You may feel more energetic.
Ovulation (Days 13-15): Egg is released. Peak fertility.
Luteal Phase (Days 15-28): Progesterone rises. PMS symptoms may develop.
PMS and Premenstrual Symptoms
Premenstrual Syndrome (PMS) typically occurs 5-7 days before your period. Common symptoms include mood swings, bloating, breast tenderness, fatigue, and cravings. Symptoms usually end when your period starts. Tracking your cycle helps you anticipate and manage these symptoms.
Frequently Asked Questions
To predict your next period, add your cycle length to the first day of your last period. For example, if your last period started January 1 and your cycle is 28 days, your next period should start around January 29. This calculator does this automatically for you.
A normal menstrual cycle is 21-35 days long, with an average of 28 days. The cycle starts on the first day of your period and ends the day before your next period. If your cycle is consistently shorter or longer than this range, talk to your healthcare provider.
Your fertile window is typically 5 days before ovulation and the day of ovulation itself. For a 28-day cycle, this is roughly days 10-15. Sperm can live up to 5 days inside your body, and an egg survives about 24 hours after ovulation. This is when you're most likely to get pregnant.
Ovulation typically occurs around the middle of your cycle. For a 28-day cycle, this is usually around day 14. For longer cycles, ovulation happens later. You can track ovulation using basal body temperature, cervical mucus changes, or ovulation prediction kits.
Premenstrual Syndrome (PMS) is a combination of physical and emotional symptoms that occur before your period. Symptoms typically start 5-7 days before your period begins and include mood changes, bloating, breast tenderness, fatigue, and cravings. Symptoms usually end when your period starts.
Yes, it's normal for cycle length to vary slightly from month to month. However, if you notice significant changes or irregular periods, talk to your healthcare provider. Stress, illness, diet, and exercise can all affect your cycle length.