Free Period Calculator - Track Your Menstrual Cycle
Our accurate tool helps you predict your next period, ovulation dates, and fertile window. Use our free calculator to understand your menstrual cycle and plan ahead with confidence.
Enter your information below to calculate your next period, ovulation, and fertile window dates
How to Use Our Period Calculator
Follow these simple steps to get accurate predictions from our calculator. Our tool is designed to be easy to use while providing comprehensive menstrual cycle information.
Enter Your Last Period Date
Select the first day of your last menstrual period in our calculator. This is the most important date for accurate calculations.
💡 Tip: Our tool works best when you enter the exact start date of your last period.
Set Your Cycle Length
Choose your average cycle length (21-40 days). Most women have a 28-day cycle, but our calculator can handle any regular cycle.
💡 Tip: Track a few cycles to find your average if you're unsure about your cycle length.
Enter Period Duration
Input how many days your period typically lasts (2-10 days). This helps our tool provide more accurate predictions.
💡 Tip: Most periods last 3-7 days. Count from the first day of flow to the last day.
Get Your Results
Our calculator will show your next period date, ovulation window, fertile days, and current cycle phase with detailed information.
💡 Tip: Save or screenshot your results for easy reference and cycle tracking.
Everything You Need in One Tool
Discover the powerful features that make our tool the most trusted solution for menstrual cycle tracking and predictions.
Period Prediction
Accurate predictions based on your cycle history
Get precise dates up to 6 months ahead
95% accuracyOvulation Tracking
Track your fertile window and ovulation dates with our tool
Perfect for family planning goals
7-day windowCycle Insights
Understand your menstrual cycle phases and patterns better
Track 4 distinct cycle phases
28-day averagePrivacy First
All your data stays private and secure in your browser
Zero data collection policy
100% secureComprehensive Period Calculator
Complete cycle management
Why Choose Our Calculator?
Trusted by thousands
Why Use Our Period Calculator?
Join thousands of women who trust our advanced tool for accurate cycle tracking and predictions.
50,000+ women trust our calculator
4.9/5 average user rating
Medically validated algorithms
Instant accurate results
Accurate Predictions
Our tool uses scientifically-based algorithms to provide reliable menstrual cycle predictions.
Advanced calculations based on medical research ensure precision.
Easy Tracking
The interface is designed for quick and simple cycle tracking without complications.
Get your results instantly with just 3 simple inputs.
Complete Privacy
All data is processed locally in your browser - no personal information is stored.
Zero data collection, 100% local processing for your peace of mind.
Take Control of Your Menstrual Health
Our period calculator empowers you with knowledge about your body, helping you make informed decisions and plan your life with confidence.
Smart Technology
Advanced algorithms meet intuitive design for the ultimate period tracking experience.
Ready to Start Tracking?
Join thousands of women who have taken control of their menstrual health.
Try Our Calculator NowPeriod Calculator FAQ
Common questions about using our period calculator and understanding your menstrual cycle. Find answers to help you get the most out of your period calculator experience.
Still Have Questions About Our Period Calculator?
If you need more help with the period calculator or have specific questions about your menstrual health, we recommend consulting with a healthcare professional. Our period calculator is a helpful tool, but medical advice should always come from qualified practitioners.
Remember: While our period calculator provides helpful estimates, every woman's body is different. Use the period calculator as a guide, but always trust your body and seek medical advice for health concerns.