How fertility changes with age
Natural fertility gradually declines with age, more noticeably after the mid-30s, due to a decreasing number and quality of eggs. Population studies estimate the average per-cycle chance of conception (fecundability) for couples trying naturally at different ages.
How this calculator works
Based on your age, the calculator applies a commonly cited average per-cycle conception probability from fertility research, then estimates your approximate chance over a full year of trying (12 cycles) using the formula: Annual Chance = 1 – (1 – per-cycle chance)^12.
This tool provides general, population-average educational estimates only, not a personal fertility diagnosis or guarantee. Individual fertility depends on many factors beyond age, including overall health and reproductive history; consult a fertility specialist for personalized evaluation.