Calculate your fertile window and ovulation date for family planning
Typical range: 21-35 days (average 28)
Ovulation Date
Friday, May 8, 2026
🌸 You are in your fertile window!
Best time to conceive
May 3 - May 9
6-day window with highest pregnancy chance
Friday, May 22, 2026
in 14 days
Cycle Day
15
Cycle Length
28
Ovulation is when an ovary releases an egg. This typically occurs about 14 days before your next period starts. The egg survives for 12-24 hours after release, but sperm can live up to 5 days in the female reproductive tract, creating a 6-day fertile window.
Your fertile window is the 6-day period when pregnancy is possible. It includes the 5 days before ovulation and ovulation day itself. The highest pregnancy rates occur when intercourse happens in the 2-3 days before ovulation.
Pregnancy Probability by Day:
Important: This calculator uses the calendar method, which works best for regular cycles. For irregular cycles, consider using ovulation predictor kits (OPKs) or tracking basal body temperature for more accuracy.
Monitor your cycle for 3-6 months to identify patterns. Use apps, charts, or calendars to track period start dates and cycle length.
Ovulation predictor kits (OPKs) detect the LH surge 24-36 hours before ovulation, giving you advance notice of your most fertile days.
Have intercourse every 1-2 days during your fertile window. Daily is fine, but every other day ensures optimal sperm count.
Being significantly underweight or overweight can affect ovulation. Aim for a BMI between 18.5-24.9 for optimal fertility.
High stress can delay ovulation or prevent it entirely. Practice relaxation techniques, exercise moderately, and get adequate sleep.
Start taking folic acid (400-800 mcg daily) before conception to prevent neural tube defects and support early pregnancy.
For women with regular 28-day cycles, it's quite accurate. However, ovulation can vary by 1-2 days even in regular cycles. For irregular cycles, use ovulation predictor kits or basal body temperature tracking for better accuracy.
It's very unlikely but not impossible. Sperm can survive up to 5 days, and ovulation timing can vary. If you're trying to avoid pregnancy, use reliable contraception throughout your cycle.
Track your cycle for several months to find your average length. Use ovulation predictor kits, monitor cervical mucus, or track basal body temperature for more accurate prediction. Consult a doctor if cycles vary by more than 7-9 days.
If you're under 35, try for 12 months. If you're 35 or older, see a fertility specialist after 6 months. Seek help sooner if you have known fertility issues, very irregular cycles, or medical conditions affecting fertility.
Not necessarily. While daily intercourse during the fertile window is fine, every other day is equally effective and may be easier to maintain. Frequent ejaculation can slightly reduce sperm count, but it's usually not a concern.
The calendar method alone is not reliable for birth control (76-88% effective with perfect use). Ovulation can vary, and sperm can survive several days. Use reliable contraception if you want to prevent pregnancy.