Breast Cancer Risk Calculator

Race/Ethnicity

Current Age

Project Forward (years)

Age at First Period

Age at First Live Birth

Number of Prior Breast Biopsies

Atypical Hyperplasia Found (if any biopsies)

First-Degree Relatives with Breast Cancer

Your risk

0.79%

Average for your age/race

0.63%

Above Average

Your estimated risk is above average — worth a conversation with your doctor.

Both are 5-year risk estimates from the same Gail model — the average uses no personal risk factors, only your age and race.

Questions to bring to your next appointment

Given my personal risk factors, does my screening schedule (mammogram frequency, starting age) need to change?
Would genetic counseling or testing (e.g. BRCA1/2) be worth discussing given my family history?
Are there lifestyle changes — alcohol, weight, activity — that meaningfully move a risk estimate like this one?

Gail model estimate — informational only, not a substitute for genetic counseling or clinical assessment.

How this is calculated

Implements the NCI Gail model: your risk factors set a relative risk, which scales age-specific baseline incidence rates (SEER data), integrated over the projection years while accounting for competing mortality. Coefficients come from NCI's own open-source BCRA package.

Breast Cancer Risk (Gail Model)