Chances of Getting Pregnant Calculator

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Leave blank to see a typical 12-month estimate.

chance per cycle

chance within 12 months

These are general population averages from published reproductive research, not a personal diagnosis — individual fertility depends on far more than age alone, including both partners' health, cycle regularity, and underlying conditions. Most guidelines suggest speaking with a doctor after 12 months of trying under age 35, or after 6 months if you're 35 or older.

How this is calculated

The per-cycle chance shown here ("fecundability") is based on published, age-banded estimates of how likely a couple with regular, unprotected intercourse is to conceive in a single menstrual cycle. Broadly, that likelihood is highest in the twenties, declines gradually through the thirties, and drops more noticeably after around age 40, reflecting the natural decline in egg quantity and quality over time.

The cumulative estimate treats each cycle as an independent chance at conceiving, and combines them using standard probability math: if "p" is your chance of conceiving in any one cycle, your chance of conceiving within a given number of cycles is 1 − (1 − p) raised to the number of cycles. In plain terms, each additional month of trying adds another opportunity, so the odds build up over time even though any single cycle's chance looks modest on its own.

Behind both numbers is basic reproductive biology: conception can only happen if intercourse occurs during the fertile window around ovulation, since sperm can survive up to about five days in the body while an egg is generally viable for roughly 24 hours after release. Timing intercourse within that window — which our Ovulation Calculator can help estimate — matters a great deal for any individual cycle's actual odds, even though this tool only shows an age-based average.

Common edge cases

These figures describe a general population, not any one person or couple. They don't account for cycle regularity, whether intercourse is timed to the fertile window, either partner's individual reproductive health, body weight, smoking, or underlying conditions like endometriosis, PCOS, or blocked fallopian tubes — all of which can meaningfully shift the real odds up or down from the average shown here.

Male-partner fertility factors account for a substantial share of cases where conception takes longer than expected, so age-based estimates for the person carrying a pregnancy only tell part of the story for a couple trying to conceive.

If you have a known condition that can affect fertility, or if pregnancy loss has occurred previously, it's reasonable to talk with a doctor sooner than the general 12-month (or 6-month, if 35 or older) guideline — those timeframes are a starting point for otherwise healthy couples, not a hard rule.

Sources

The age-based fecundability estimates used here reflect widely cited reproductive research. For more on fertility, age-related fertility decline, and when to seek an evaluation, see the American College of Obstetricians and Gynecologists (ACOG), Mayo Clinic, and NICHD.