Breast Cancer Risk Assessment
This simplified calculator combines Gail-model style factors to stratify risk. Use with professional guidelines to determine screening and prevention plans.
Age at menarche
Age at first live birth
First-degree family history
Breast biopsies
Risk score
—
Risk category
Incomplete
Estimated risk
5-year: — | Lifetime: —
How to Use This Calculator
Gather key risk factors
Include reproductive history, biopsy history, breast density, and family history of breast cancer.
Enter demographic information
Age and ancestry influence baseline risk and screening recommendations.
Discuss results with a provider
Use this estimate as a conversation starter for screening schedules, chemoprevention, or genetic counseling.
Formula
Risk score = Age modifier + Menarche points + First-birth points + Family history points + Biopsy points + Atypia (3 points if yes) + Dense breasts (1 point if yes) + Race/ethnicity adjustment.
Age modifiers: 50–64 years = +1, ≥65 years = additional +1.
Interpretation thresholds: ≤3 (Average risk), 4–6 (Elevated risk), ≥7 (High risk). These thresholds align with common clinical cutoffs for enhanced surveillance or referral.
Full Description
Breast cancer risk is multifactorial. This calculator mirrors core inputs from the Gail Model and other widely used risk tools. Factors such as early menarche, late first birth, positive family history, atypical hyperplasia, and dense breasts increase lifetime risk. High-risk individuals may benefit from earlier or more frequent imaging, chemoprevention (tamoxifen, raloxifene), or genetic evaluation. Formal risk models (Gail, Tyrer-Cuzick, BOADICEA) should be used for clinical decision-making.
Frequently Asked Questions
Is this calculator the same as the Gail Model?
No. It approximates risk using similar inputs but does not compute exact Gail Model probabilities. Use official models for clinical decisions.
What if I have BRCA or other pathogenic variants?
Hereditary mutations confer markedly higher risk. Follow genetics-guided surveillance and prevention protocols.
Does hormone therapy affect this score?
Postmenopausal hormone therapy increases risk. Discuss with your clinician when interpreting results.
Can lifestyle changes modify risk?
Yes. Maintaining healthy weight, limiting alcohol, exercising, and breastfeeding (when possible) are associated with reduced risk.