Personalized Fertility Analyzer
How are fertility chances calculated?
Your probability of conception depends on three primary factors: Age, Timing, and Cycle Health. Biological data shows that even with perfect timing, the maximum chance of pregnancy per cycle is around 30% for a healthy couple in their 20s.
Our fertility calculator uses these statistical baselines combined with your specific cycle length and intercourse dates to provide a realistic estimate for your current cycle.
When am I most fertile?
You are most fertile during your fertile window, which is the six-day period ending on the day of ovulation. Sperm can survive for up to 5 days, while the egg is only viable for about 24 hours. Therefore, having intercourse 1-2 days before ovulation yields the highest pregnancy chances by day.
Fertility by Age Chart
| Age Group | Conception Chance |
|---|---|
| Under 25 | ~96% per year |
| 25–30 | ~86% per year |
| 30–35 | ~78% per year |
| 35–40 | ~50% per year |
| 40+ | ~10-20% per year |
Note: Percentages refer to healthy couples trying for 12 months.
Why age matters after 35
Fertility declines gradually after age 30, but there is often a sharper drop after 35. This is primarily because women are born with a finite number of eggs, and as time passes, both the quantity and the genetic quality of those eggs decrease. This makes our chances of pregnancy at 35 calculator a vital tool for planning your family timeline.