PregnancyCalc.comPregnancy Calculators
Fertility Probability Estimate
Pregnancy Chance by Age Calculator
Understand your approximate probability of conceiving per cycle and within a year based on your age.
Per-cycle estimate
Annual probability
Age-based data
Pregnancy Chance Calculator by Age — Estimated Probability of Conception
Enter your age to see the estimated per-cycle probability of conception. Population averages only.
⚠ This calculator uses ACOG (American College of Obstetricians and Gynecologists) guidelines. Always follow your healthcare provider’s advice for your specific pregnancy.
Used to estimate per-cycle probability
How long you have been trying
Per-Cycle Probability
~15%
Each menstrual cycle
Within 12 Months
~80%
Trying for 1 year
Your Age
—
Primary factor
These are population-level estimates based on age-related fertility data. Actual fertility varies significantly between individuals.
Per-Cycle Pregnancy Probability by Age
Under 25
~25%
per cycle
25-29
~20%
per cycle
30-34
~15%
per cycle
35-39
~7-10%
per cycle
Pregnancy Chance Calculator by Age — Key Information
Peak FertilityFertility is highest in the mid-20s. Per-cycle probability approximately 20-25%.
Age 30-34Fertility begins to decline gradually. Per-cycle probability approximately 15%.
Age 35+Fertility declines more rapidly after 35. Per-cycle probability drops to 7-10% by age 38.
The 1-Year RuleSeek advice after 12 months of trying under 35, or 6 months over 35.
Other FactorsThese estimates assume no underlying fertility conditions.
When to Seek HelpIf over 35 or concerned, speak to a GP or fertility specialist sooner.