Interactive Period & Ovulation
HealthTrack your menstrual cycle and estimate ovulation/fertile days.
Usually 28 days for most women.
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How to Use Period & Ovulation
Enter the start date of your last period and your average cycle length (typically 28 days). The tracker estimates your next period start date, ovulation window, and fertile days. Mark past period dates to improve prediction accuracy over time. All data stays in your browser — nothing is sent to any server.
Enter your parameters
Configure the inputs for the Period Tracker according to your specific needs.
View real-time results
The utility instantly processes your request and displays the calculated outputs directly in your browser.
Copy or Download
Click the copy icon next to the final output to instantly grab the result, or export it if applicable.