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Period & Ovulation
健康Track your menstrual cycle and estimate ovulation/fertile days.
ttb run period-tracker
Days
Usually 28 days for most women.
Days
Disclaimer: This tool uses standard mathematical averages and calendar mappings. It is an estimation tool and should not be used exclusively for medical prevention or family planning.
Estimated Next Period
Thu, April 23
Through Mon, April 27
Fertility Window (High Chance)
Sat, April 4
To Fri, April 10
Peak Ovulation: Thu, April 9
When to take a Pregnancy Test
Wed, April 22
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如何使用 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.
1
Enter your parameters
Configure the inputs for the Period Tracker according to your specific needs.
2
View real-time results
The utility instantly processes your request and displays the calculated outputs directly in your browser.
3
Copy or Download
Click the copy icon next to the final output to instantly grab the result, or export it if applicable.
常见问题
How accurate are cycle predictions?+
For regular cycles (21-35 days with less than 7-day variation), predictions are quite reliable. Irregular cycles are harder to predict. Stress, travel, illness, and hormonal changes can all shift your cycle timing.
Is my health data private?+
Yes. All data is stored exclusively in your browser's local storage. No health information is transmitted to any server, tracked, or logged. Clearing your browser data removes all records.