Global Araç
Ovulation Calculator
Yumurtlama günü
May 25, 2026
Doğurgan pencere
May 20 – May 25, 2026
Sonraki adet
Jun 8, 2026
Döngü uzunluğu
28 gün
| Döngü | Doğurgan pencere | Yumurtlama | Sonraki adet |
|---|---|---|---|
| #1 | May 20 – May 25, 2026 | May 25, 2026 | Jun 8, 2026 |
| #2 | Jun 17 – Jun 22, 2026 | Jun 22, 2026 | Jul 6, 2026 |
| #3 | Jul 15 – Jul 20, 2026 | Jul 20, 2026 | Aug 3, 2026 |
Nasıl çalışır
- Yumurtlama, adetin ilk gününden (döngü uzunluğu − 14) gün sonra olarak tahmin edilir.
- Doğurgan pencere, yumurtlamadan önceki 5 gün artı yumurtlama gününü kapsar.
- Yalnızca tahmindir — doğruluk için bazal sıcaklık takibi yapın veya LH testleri kullanın.
Find your most fertile days from the date of your last period and your average cycle length. The tool estimates ovulation (around 14 days before your next period), the six-day fertile window leading up to it, and the predicted start of your next three cycles — useful whether you're trying to conceive or planning around your cycle.
This is a rhythm-based estimate; real ovulation varies by a few days from cycle to cycle. For higher accuracy combine with basal body temperature tracking or ovulation test strips. If you've already conceived, switch over to pregnancy calculator for due-date and week math.
Nasıl Kullanılır
- Enter the first day of your last period.
- Enter your average cycle length (default 28 days).
- Review your predicted ovulation day and fertile window.
- Plan around the next three predicted cycles shown below.
Ne Zaman Kullanılır
- Planning around your most fertile window (typically day 10–14 of a 28-day cycle).
- Tracking cycle regularity across several months to spot patterns.
- Estimating when your next period is due for travel, events, or workouts.
- Combining with basal body temperature or LH strips for higher-confidence timing.
Ne Zaman Kullanılmaz
- Reliable contraception — rhythm-based estimates are not a birth-control method.
- Irregular cycles where length varies by more than ±5 days — ovulation tests are more reliable here.
- Medical fertility workup — see a clinician for AMH, ultrasound, and lab-based ovulation confirmation.
- Post-hormonal-contraception cycles (IUD removal, pill stoppage) while cycles are still stabilizing.
Örnek
Last period started: Apr 1 Average cycle: 28 days
Predicted ovulation: Apr 15 (Day 14) Fertile window: Apr 10–Apr 15 Next period: Apr 29
Shifting the cycle length to 30 days moves ovulation to Day 16 (Apr 17). The 6-day fertile window always ends on ovulation day.
Sık Sorulan Sorular
Is ovulation always 14 days before the next period?
The luteal phase (ovulation → next period) is more consistent at about 14 days than the follicular phase (period → ovulation). In a 30-day cycle, ovulation is closer to day 16; in a 26-day cycle, closer to day 12. The tool counts back 14 days from predicted next period for this reason.
Why is the fertile window six days long when I only ovulate once?
Sperm can survive in the reproductive tract for up to 5 days, so intercourse from 5 days before ovulation through ovulation day itself can all result in conception. The egg itself is viable for ~24 hours.
Can I use this for birth control?
No. Even in regular cycles, ovulation can shift by 3–4 days due to stress, illness, or travel. The failure rate of rhythm-based methods is 12–24% per year. For contraception, use a clinically reviewed method.
I've already conceived — what do I use?
Switch over to the pregnancy calculator, which takes your LMP and returns a due date (Naegele's rule: LMP + 280 days) plus your current week and trimester.