Period & Ovulation Tracker
Predict next period, fertile window, and ovulation using your average cycle length with gentle reminders.
Period Calculator
Predict your next period, ovulation day, and fertile window based on your typical cycle length
Most cycles range between 24 and 35 days.
Ovulation typically occurs 14 days before your next period.
6 cycles
🩸Next period starts
Sunday, August 30, 2026
Ends Thursday, September 3, 2026
✨Ovulation day
Sunday, August 16, 2026
Fertile window Aug 11, 2026 – Aug 17, 2026
⏱️Cycle length
28 days
5 day period
📅Projected cycles
6 upcoming
Aug 30, 2026 → Jan 17, 2027
Upcoming cycle timeline
We project the next 6 cycles using your averages. Actual timing can shift with stress, travel, postpartum changes, or hormonal contraception.
| Cycle | Period | Ovulation | Fertile window | Days until |
|---|---|---|---|---|
| Cycle 1 | Aug 30, 2026 – Sep 3, 2026 | Aug 16, 2026 | Aug 11, 2026 – Aug 17, 2026 | Happening now |
| Cycle 2 | Sep 27, 2026 – Oct 1, 2026 | Sep 13, 2026 | Sep 8, 2026 – Sep 14, 2026 | 27 days |
| Cycle 3 | Oct 25, 2026 – Oct 29, 2026 | Oct 11, 2026 | Oct 6, 2026 – Oct 12, 2026 | 55 days |
| Cycle 4 | Nov 22, 2026 – Nov 26, 2026 | Nov 8, 2026 | Nov 3, 2026 – Nov 9, 2026 | 83 days |
| Cycle 5 | Dec 20, 2026 – Dec 24, 2026 | Dec 6, 2026 | Dec 1, 2026 – Dec 7, 2026 | 111 days |
| Cycle 6 | Jan 17, 2027 – Jan 21, 2027 | Jan 3, 2027 | Dec 29, 2026 – Jan 4, 2027 | 139 days |
Cycle insights
- • Track at least three months to refine your average cycle length.
- • Ovulation predictor kits or basal temperature tracking can confirm fertile days.
- • Stress, illness, and travel can delay ovulation or shorten the luteal phase.
Important notes
- • This tool offers estimates and is not a substitute for medical advice.
- • Irregular cycles, PCOS, postpartum recovery, or hormonal birth control may alter results.
- • See a clinician if your period is consistently very short, very long, or absent.