Period Calculator
Track your menstrual cycle, predict your next period, and calculate your fertile window. Stay informed about your reproductive health with accurate cycle predictions.
Period Tracking
Enter your cycle details to predict your next period and fertile days
Default is 28 days. Range: 22-44 days
Default is 5 days. Range: 3-10 days
Next Period
Enter your cycle details to predict your next period.
Understanding Your Cycle
Menstrual Cycle Phases
- Menstrual Phase: Days 1-5 (period bleeding)
- Follicular Phase: Days 1-13 (egg development)
- Ovulation: Around day 14 (egg release)
- Luteal Phase: Days 15-28 (preparation for pregnancy)
Calculation Method
- Next Period: LMP + Cycle Length
- Ovulation: LMP + (Cycle Length - 14)
- Fertile Window: Ovulation ± 2 days
- Forecast: Repeat for next 6 cycles
Fertility & Timing
- Most fertile: 2 days before ovulation
- Fertile window: 5 days total around ovulation
- Sperm survival: Up to 5 days in reproductive tract
- Egg survival: 12-24 hours after ovulation
Important Notes
- This calculator provides estimates based on average cycles
- Actual cycles can vary due to stress, illness, or lifestyle
- Track your cycle for 3+ months for better accuracy
- Consult healthcare providers for irregular cycles
How to Use This Calculator
Step-by-step guide to get accurate results
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Period Calculator: Track Your Menstrual Cycle Accurately
Understanding your menstrual cycle is essential for managing your health, planning pregnancies, and tracking fertility. Our Free Period Calculator Online helps you predict your next period, ovulation dates, and fertile window with ease and accuracy. Whether you have a regular cycle or irregular periods, this tool provides personalized insights based on your menstrual data.
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How to Use the Period Calculator
Using our Menstrual Cycle Calculator is simple:
Step 1: Enter Last Period Date (LMP)
Input the first day of your last menstrual cycle.
Step 2: Enter Average Cycle Length
Typically 28 days, but it can range from 21 to 35 days.
Step 3: Press 'Calculate'
Get your next period date, fertile window, and ovulation date instantly.
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Why Use a Period Calculator?
Tracking your cycle offers multiple benefits:
Plan for Pregnancy
Know your ovulation days with our Ovulation and Fertility Calculator.
Monitor Irregular Cycles
Understand how cycle length affects your fertility days.
Track Symptoms
Predict PMS or period-related changes.
Health Insights
Detect changes in your menstrual cycle that may require medical attention.
AI-Based Prediction
Use AI-powered cycle tracking for higher accuracy.
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Understanding Menstrual Cycles, Ovulation & Fertility
Get a deeper understanding of your reproductive health:
What is a Menstrual Cycle?
A monthly process involving ovulation, bleeding, and hormone changes. A typical cycle lasts 21–35 days, with menstruation usually 3–7 days.
Fertile Window Explained
The fertile window is the period when conception is most likely, usually 5 days before ovulation and on the day of ovulation.
Ovulation and Conception
Ovulation occurs when an egg is released from the ovary, usually mid-cycle. Tracking ovulation increases the chances of pregnancy.
Frequently Asked Questions
How accurate is a period calculator?
A period calculator predicts your cycle based on your input. Accuracy is highest with regular cycles and improves with AI-based tools.
Can I use a period calculator for irregular periods?
Yes, our smart menstrual tracker adapts to irregular cycles to provide personalized predictions.
What is the normal length of a menstrual cycle?
A normal cycle ranges from 21–35 days, with an average of 28 days.
How do I track my fertile days?
Enter your cycle information in the Period and Ovulation Tracker to see your fertile window and ovulation dates.
Are there period calculators with reminders?
Yes, some period calculator apps include reminders that notify you before your next period or fertile window.