Next period
Sample
Average cycle 28 days, last start date
What you get
Projected next period start (tracking aid).
Period Calculator
Stress, travel, and hormones shift cycles; this is heuristic.
Period Calculator
YearMonthDay
Next period (estimate)
Jun 29, 2025
Following
Jul 27, 2025
These tools provide general fitness estimates only and are not a substitute for professional medical advice.
How to Use This Tool
- Enter last period start.
- Set average cycle days.
- See next one–two predicted starts.
Features
- Two upcoming cycles preview
- 21–45 day cycles
- Quick copy
Example
Frequently Asked Questions
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