Estimate your per-cycle chance using age, time trying, sex frequency, known factors, and recent contraception. See a 3, 6, and 12 cycle timeline, the cycles to reach 50% and 80%, and when to consider a fertility work-up.
How this calculator works
- Inputs: female age, optional male age, average cycle length, months or cycles trying so far, sex frequency per fertile window (once, 2-3 times, daily), known factors (PCOS, endometriosis, fibroids, none), recent contraception stopped (pill, IUD, implant, Depo, none).
- Outputs: per-cycle chance, cumulative chance to 3/6/12 cycles, cycles to 50% and 80% likelihood, when to consider a fertility work-up, and links to the Fertility Calculator and Ovulation tools.
Methodology & limits
The estimate starts from age-based baseline fecundability (chance per cycle) and adjusts for male age and reported factors. Sex frequency modifies the per-cycle chance by assuming more covered fertile days. Recent contraception is treated as a short-term adjustment to the early cycles after stopping. Average cycle length sets timing context, not the base probability.
The cumulative curve assumes independent cycles and shows the chance of at least one pregnancy by 3, 6, and 12 cycles. Months or cycles already tried shift your position on that curve; they do not lower the per-cycle chance unless a factor is selected.
Results are estimates for planning. This does not diagnose infertility or replace personalised care. For concerns, see a clinician.
Frequently asked questions
Does sex frequency change my chance?
Yes. More frequent sex across the fertile window increases the chance that one act lands near ovulation.
Do months already trying reduce my per-cycle chance?
No. They place you further along the cumulative curve. The per-cycle chance is based on your inputs for this cycle.
Does cycle length affect probability?
Cycle length sets timing context. The base chance comes from age and factors, not the number of days in the cycle.
When should we seek a fertility work-up?
Many clinicians advise after 12 months if under 35, after 6 months at 35-39, and sooner at 40+ or with known factors. This is educational only.
Will recent contraception delay return of fertility?
Most people ovulate again soon after stopping, but some methods take longer. The tool applies a short-term adjustment to early cycles.