What is the pregnancy probability by age?

Monthly probability varies significantly: approximately 25% at age 25, 20% at 30, 15% at 35, 5% at 40, and 1% at age 45.

What is the fertile window?

The fertile window is the days around ovulation with the highest chance of conception. Ovulation day and the 1-2 days before are the most fertile.

How does time trying affect cumulative probability?

Cumulative probability increases each month. It's calculated as: P = 1 - (1 - p_monthly)^months. After 12 months, most fertile couples have conceived.

When should I see a fertility specialist?

It's recommended to consult after 12 months of trying if under 35, or after 6 months if 35 or older.

Does this calculator replace medical advice?

No. This calculator is informational and uses general statistical estimates. Every person is different. Always consult a healthcare professional for personalized evaluation.

Pregnancy Probability Calculator by Age

Estimate pregnancy probability based on your age, time trying, and cycle timing

Age (years)

Months trying

Cycle day relative to ovulation

Known fertility issues