Important dates for this cycle:
| Ovulation Window | Sep 30, 2025 - Oct 8, 2025 |
| Most Probable Ovulation Date | Oct 4, 2025 |
| Intercourse Window for Pregnancy | Sep 25, 2025 - Oct 8, 2025 |
| Pregnancy Test | Oct 13, 2025 |
| Next Period Start | Oct 18, 2025 |
| Due Date If Pregnant | Jun 27, 2026 |
| S | M | T | W | T | F | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 | 29 | 30 |
| Period Start | Ovulation Window | Due Date |
|---|---|---|
| Sep 20, 2025 | Sep 30, 2025 - Oct 8, 2025 | Jun 27, 2026 |
| Oct 18, 2025 | Oct 28, 2025 - Nov 5, 2025 | Jul 25, 2026 |
| Nov 15, 2025 | Nov 25, 2025 - Dec 3, 2025 | Aug 22, 2026 |
| Dec 13, 2025 | Dec 23, 2025 - Dec 31, 2025 | Sep 19, 2026 |
| Jan 10, 2026 | Jan 20, 2026 - Jan 28, 2026 | Oct 17, 2026 |
| Feb 7, 2026 | Feb 17, 2026 - Feb 25, 2026 | Nov 14, 2026 |
This calculator estimates ovulation windows for the next six cycles based on your last period and cycle length. Ovulation occurs 10-18 days before the next period, with peak fertility around day 14. Regular intercourse 5 days before and on ovulation day increases pregnancy chances. This tool is not for birth control.