Period Tracker
Track your menstrual cycle with period dates, flow intensity, and symptoms. View your cycle history in an interactive calendar, get predictions for your next period and fertile window, and explore detailed cycle statistics - all processed locally in your browser with complete privacy.
Track your menstrual cycle with period dates, flow intensity, symptoms, and notes. View your cycle in a calendar, see detailed cycle stats, and get predictions for your next period, ovulation window, and fertile days. All data stays private in your browser - no account needed.
No periods logged yet
Click "Log Period" above to start tracking your cycle.
All data is saved to your browser's localStorage. Your cycle information stays completely private - no data is ever sent to any server.
Why Use Our Period Tracker?
Visual Calendar & Cycle Predictions
View your entire cycle history in an interactive monthly calendar with colour-coded days for period, fertile window, and predicted ovulation. The tool automatically learns from your logged cycles to predict your next period start date, ovulation day, and fertile window - predictions get more accurate as you log more cycles.
Private - Saved Locally in Your Browser
Your cycle data is saved to your browser's localStorage. No accounts, no signup, no server uploads - your personal health information never leaves your device. All period dates, flow intensity, symptoms, and notes stay completely private on your computer.
Comprehensive Cycle Statistics
Track key metrics including average cycle length, average period duration, shortest and longest cycles, total periods logged, and flow intensity distribution. View symptom frequency charts to identify patterns across your cycles. The stats view gives you meaningful insights into your menstrual health over time.
Detailed Symptom & Flow Tracking
Log flow intensity (light, medium, heavy) for each day of your period, with per-day adjustment controls. Track 10 common symptoms including cramps, headaches, bloating, fatigue, mood swings, nausea, backache, breast tenderness, acne, and cravings. Add notes for each period to capture additional context.
Common Use Cases for the Period Tracker
Regular Cycle Monitoring
Track the start and end dates of each period to build a complete cycle history. The more cycles you log, the more accurate your predictions become. View your average cycle length and period duration at a glance, and use the calendar to see your entire cycle history in one place.
Planning & Preparation
Use the predicted next period date to plan vacations, events, or important activities around your cycle. The fertile window and ovulation predictions help with family planning - whether you are trying to conceive or practising natural cycle awareness.
Symptom Pattern Recognition
Log symptoms like cramps, headaches, mood swings, and bloating with each period. Over time, the symptom frequency chart reveals patterns - helping you anticipate symptoms before they start and discuss them more accurately with your healthcare provider.
Health Insights & Awareness
Monitor cycle regularity with stats on shortest and longest cycles, average period length, and flow distribution. Irregular cycles, sudden changes in flow intensity, or new symptom patterns can be important health signals worth discussing with a doctor.
Fertility Awareness
Track your fertile window and predicted ovulation day for natural fertility awareness. The prediction algorithm uses your average cycle length and the standard luteal phase (14 days) to estimate ovulation. Combine with the period calendar for comprehensive cycle tracking.
Postpartum Cycle Tracking
After pregnancy, use the tracker to monitor the return of your menstrual cycle. Track how your cycle length, period duration, flow intensity, and symptoms may have changed. Building a new cycle history helps you understand your postpartum patterns and discuss them with your healthcare provider.
Understanding the Period Tracker
What Is the Period Tracker?
The Period Tracker is a free, browser-based tool that helps you monitor your menstrual cycle with complete privacy. Log your period start and end dates, track flow intensity (light, medium, heavy) for each day, record 10 common symptoms, and add notes for context. View your cycle history in an interactive calendar, explore detailed cycle statistics (average cycle length, period duration, flow distribution, symptom frequency), and get predictions for your next period, ovulation day, and fertile window. All your data is saved to localStorage - no accounts, no signup, no server uploads.
How Our Period Tracker Works
- 1. Log a Period: Click "Log Period" and enter the start date and end date. The tool automatically breaks your period into individual days. Set the default flow intensity for the entire period, then optionally adjust the flow for specific days using the per-day dropdowns. Tap symptoms to toggle them on or off, and add optional notes for additional context.
- 2. View Your Calendar: The calendar view shows your logged period days with colour-coded flow intensity (light pink, medium red, heavy rose). Predicted future periods appear with a dashed border. The fertile window is highlighted in green, and ovulation day in blue. Navigate between months using the arrow buttons or jump to today.
- 3. Explore Statistics: The Stats view shows your flow distribution (percentage of light, medium, and heavy days), symptom frequency across all logged periods, and a cycle history table with each period's duration and the following cycle length.
- 4. Get Predictions: After logging at least one period, the tool predicts your next period start and end dates based on your average cycle length. Ovulation is estimated using the standard 14-day luteal phase. The fertile window spans 5 days before ovulation through 1 day after. Predictions become more accurate as you log more cycles.
Key Features of the Period Tracker
- Interactive Calendar: Monthly calendar view with colour-coded days for periods (with flow intensity), predicted periods, fertile window, and ovulation. Navigate between months freely.
- Cycle Predictions: Automatic predictions for next period, ovulation day, and fertile window based on your logged cycle history. Predictions improve with more data.
- Flow Intensity Tracking: Log light, medium, or heavy flow for each day of your period. Per-day adjustment lets you capture variation within a single period.
- 10 Pre-Defined Symptoms: Cramps, headache, bloating, fatigue, mood swings, nausea, backache, breast tenderness, acne, and cravings - with emoji icons for quick identification and frequency tracking.
- Cycle Statistics: Average cycle length, average period duration, shortest/longest cycles, total periods logged, flow distribution chart, and symptom frequency tracker.
- localStorage Persistence:All data saved to your browser's localStorage. No accounts, no signup, no server uploads - your data stays completely private on your device.
Important Notes on Period Tracking
Your data stays on your device:The Period Tracker saves your cycle data to your browser's localStorage. This means your information stays on your device and is never transmitted to any server. Clearing your browser data, using private/incognito mode, or switching browsers will remove your saved data. Not a medical device: This tracker is for personal reference and awareness only. It is not a medical device and should not be used as a sole method of contraception or fertility treatment. Always consult with a healthcare provider for medical advice. Predictions are estimates: Next period, ovulation, and fertile window predictions are estimates based on your logged cycle history and standard cycle calculations (assuming a 14-day luteal phase). Individual cycles may vary. No account needed: Unlike period tracking apps that require signup and may share data, our tool works immediately with no barriers and no data collection.
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Frequently Asked Questions About Period Tracker
Log your period start and end dates, then optionally track flow intensity (light, medium, heavy) for each day, record symptoms (cramps, headache, bloating, and more), and add notes. The tool automatically calculates your average cycle length, period duration, and predicts your next period, ovulation day, and fertile window. View everything in a colour-coded monthly calendar or explore detailed statistics. All data stays private in your browser's localStorage - no account or signup required.
The predicted next period is calculated by adding your average cycle length to the start date of your last logged period. Ovulation is estimated by subtracting 14 days (standard luteal phase length) from the predicted next period start. The fertile window spans from 5 days before predicted ovulation to 1 day after. As you log more cycles, the averages become more accurate and predictions improve. If you have only one logged period, the tool uses a default 28-day cycle length.
Yes. All your cycle data is automatically saved to your browser's localStorage. When you return to the tool, your periods, symptoms, and notes will be exactly as you left them. However, clearing your browser data, using private/incognito mode, or switching browsers will remove your saved data.
Yes. In the History view, hover over any period entry and click the edit icon to modify the dates, flow intensity, symptoms, or notes. Click the delete icon to remove a period entry entirely - a confirmation step prevents accidental deletion. Edits and deletions are reflected immediately in your calendar, statistics, and predictions.
The Period Tracker includes 10 pre-defined symptoms: cramps, headache, bloating, fatigue, mood swings, nausea, backache, breast tenderness, acne, and cravings. Each symptom has an emoji icon for quick identification. Tap any symptom to toggle it on or off when logging a period. The Stats view shows how frequently each symptom occurs across all your logged periods, helping you identify patterns.
When logging a period, you can set a default flow intensity (light, medium, or heavy) for the entire period. For more detailed tracking, the per-day flow adjustment lets you change the intensity for individual days - useful because flow often varies within a single period. The calendar shows colour intensity based on flow, and the Stats view shows your overall flow distribution as a percentage.
The Period Tracker provides estimated ovulation day and fertile window based on your cycle history. However, this tool is for personal awareness and reference only. It should not be used as a sole method of contraception or fertility treatment. The predictions are estimates based on averages and standard calculations - individual cycles can vary. Always consult with a healthcare provider for family planning or fertility concerns.
The interactive monthly calendar shows your logged period days colour-coded by flow intensity (light pink, medium red, heavy rose). Predicted future periods appear with a dashed border. The fertile window is highlighted in green, and ovulation day in blue. A greyed-out cell indicates an empty day. Navigate between months using the previous/next arrows, and click "Today" to jump to the current month.
Absolutely. Your period tracking data is saved to your browser's localStorage - no data is ever sent to any server. No accounts, no signup, no tracking. Unlike period tracking apps that may share data with third parties, our tool ensures your personal health information stays completely private on your device.
Yes - the Period Tracker is 100% free with no signup, no account, and no usage limits. Track unlimited cycles with unlimited symptoms and notes. There are no ads, no premium tiers, and no hidden costs.