Breast Cancer Risk Assessment Tools: A Guide to What's Available Today

Several validated tools can estimate your risk of developing breast cancer. Doctors use them to decide who might benefit from earlier screening, added tests like MRI, genetic counseling, or risk-reducing medication.¹ Each tool uses different information, so understanding the options can help you make sense of your own risk assessment.

This guide walks through the most widely used risk assessment tools, what each one measures, and their strengths and limitations.

A risk assessment tool, or risk model, is a calculator that estimates your chance of developing breast cancer over a set period, such as the next 5 or 10 years, or over your lifetime.¹ You or your provider enter information like your age, family history, and reproductive history, and the tool produces a percentage estimate. The results help guide decisions but do not diagnose cancer.

The Gail model, also called the Breast Cancer Risk Assessment Tool, is one of the most widely used calculators. It estimates 5-year and lifetime risk using age, reproductive history, prior biopsies, and first-degree family history.²

Its main limitations are that it only considers first-degree relatives and does not include breast density.¹ It may also be less accurate for some racial and ethnic groups, so it is best suited to women without a strong family history.

The Tyrer-Cuzick model, also known as IBIS, estimates 10-year and lifetime risk and asks about more risk factors than most other tools, including a detailed family history and breast density.³ It can also be used in women under 35 and can estimate the likelihood of carrying a BRCA1 or BRCA2 mutation.³

Because it weighs family history heavily, it is often the model of choice for women with a significant family history. It can, however, overestimate risk in some younger women and certain groups.³

The Breast Cancer Surveillance Consortium (BCSC) model improves on the Gail model by adding breast density, a meaningful risk factor. It also uses age, race or ethnicity, family history, and biopsy history to estimate 5-year risk. Its main limitation is that it focuses on short-term rather than lifetime risk.⁴

The CanRisk tool, based on the BOADICEA model, estimates both breast and ovarian cancer risk and relies heavily on family history and genetic information. It incorporates a wide range of factors, including extensive family history, genetic variants, breast density, and lifestyle factors. It may be less reliable for people at lower risk or of non-European ancestry.⁵

A newer category of tools uses artificial intelligence to estimate risk directly from a mammogram image rather than from a questionnaire. In 2025, the FDA authorized Clairity Breast, the first AI tool cleared to estimate 5-year risk from a routine mammogram.⁶ These tools can be especially helpful for women whose risk is underestimated by traditional questionnaire-based models.

There is no single best tool for everyone. The right choice depends on your history and why the assessment is being done:

• For a general estimate without strong family history, the Gail or BCSC model is often used.

• For women with a notable family history, the Tyrer-Cuzick or CanRisk model may be more appropriate.^3,5

• AI-based tools can add insight from the mammogram itself, alongside these models.⁶

Your doctor or a genetic counselor can choose the most suitable model and interpret the result in the context of your full health picture.

No risk model is perfect. A 2021 review in the Journal of Breast Imaging found that no single tool was consistently well-calibrated across studies, and different tools can give different estimates for the same person.⁷ Risk scores are best treated as one helpful input into your care, not a definitive prediction.

If you are curious about your breast cancer risk, ask your doctor whether a formal risk assessment makes sense for you. This is especially worthwhile if you have a family history of breast or ovarian cancer, dense breasts, or a prior breast biopsy. Your provider can select the right tool, explain your result, and recommend next steps such as enhanced screening or genetic counseling.

No single tool is most accurate for everyone. Each performs differently depending on your history, and a systematic review found none was consistently well-calibrated.⁷ The best tool depends on your individual situation.

Some, like the Gail model, are available online, but results are best interpreted with a doctor who can put them in context and recommend next steps.²

No. Risk assessment tools estimate the chance of developing breast cancer in the future. They do not detect or diagnose existing cancer, which is what screening tests like mammograms are for.

Each model uses different inputs and time frames, so estimates can vary. Your doctor can help you understand which result is most relevant for you.¹

Risk assessment tools are most useful when they lead to action, whether that is a tailored screening plan or a conversation about prevention. Most of the models above require a provider to run them, but the newest category is one you can access directly.

The Clairity Breast™ Cancer 5-Year Risk Assessment, available through Everlywell, uses FDA-authorized AI-driven software to analyze a routine screening mammogram from the last 12 months and estimate your personalized five-year breast cancer risk, with no questionnaire required. Provider-reviewed results are delivered to your My Everly account with guideline-based information to review with your health care provider, who may use your risk score alongside a traditional model to personalize your screening and risk-reduction plan. Clairity Breast estimates future risk; it does not detect or diagnose cancer, and it is not a substitute for mammograms or ongoing care with your provider.

Talk with your doctor about which risk assessment approach fits your history. Everlywell is here to help you stay proactive about your health.