Breast Cancer Risk Calculator (Gail Model)

Enter your age, race/ethnicity, reproductive history, and family & biopsy history to estimate your breast cancer risk using the Gail Model (BCRAT). You'll receive a 5-year risk and lifetime risk estimate compared to the average woman of the same age and race.

Disclaimer: This tool is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making any health-related decisions.

years

This tool applies to women aged 35 and older with no prior breast cancer diagnosis.

Earlier onset of menstruation is associated with slightly higher risk.

First-degree relatives include mother, sisters, and daughters.

Has the patient ever had a breast biopsy? *

Only shown if biopsy was Yes.

Did any biopsy show atypical hyperplasia?

Atypical hyperplasia (abnormal cells in the breast) significantly raises risk.

Has the patient had a prior breast cancer, DCIS, or LCIS diagnosis? *

This tool cannot accurately calculate risk for women with prior breast cancer, DCIS, or LCIS.

Does the patient have a known BRCA1 or BRCA2 mutation? *

Other tools are more appropriate for women with known BRCA mutations.

Results

Your 5-Year Risk

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Your Lifetime Risk (to age 90)

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Average 5-Year Risk (Same Age & Race)

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Average Lifetime Risk (Same Age & Race)

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Risk Category

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Frequently Asked Questions

What is the Gail Model / Breast Cancer Risk Assessment Tool?

The Gail Model (officially the Breast Cancer Risk Assessment Tool, or BCRAT) was developed by scientists at the National Cancer Institute and NSABP. It uses a woman's personal medical history, reproductive history, and family history of breast cancer to estimate the probability of developing invasive breast cancer over the next 5 years and over her lifetime (up to age 90).

Who is this tool validated for?

The tool has been validated primarily for women in the United States who identify as White, Black/African American, Hispanic, or Asian/Pacific Islander. It may underestimate risk in Black/African American women with previous biopsies and Hispanic women born outside the United States. It is not designed for women who have already been diagnosed with breast cancer, DCIS, or LCIS.

What does '5-year risk' mean?

Your 5-year risk is the estimated probability that you will develop invasive breast cancer in the next five years. For example, a 5-year risk of 2% means approximately 2 out of every 100 women with your profile would be expected to develop breast cancer over that period.

What is considered a high risk result?

A 5-year risk of 1.7% or greater is generally considered 'high risk' and is the threshold often used to discuss preventive interventions such as chemoprevention medications. A lifetime risk above 20% may also qualify a woman for enhanced screening, such as annual MRI in addition to mammography.

Should women with BRCA mutations use this tool?

No. The Gail Model is not appropriate for women with known BRCA1 or BRCA2 mutations or other hereditary syndromes associated with high breast cancer risk. Other specialized tools (such as BOADICEA or Tyrer-Cuzick) are better suited for these individuals.

What does atypical hyperplasia mean and how does it affect risk?

Atypical hyperplasia refers to abnormal but non-cancerous cells found in a breast biopsy. Having atypical hyperplasia significantly increases breast cancer risk—roughly 4 to 5 times compared to women without it—and is one of the stronger risk factors captured by the Gail Model.

How accurate is this risk estimate?

The Gail Model provides a statistical estimate based on population data. While it is well-validated for groups of women, it cannot precisely predict which individual woman will or will not develop breast cancer. Some women with low estimated risk do develop breast cancer, and many with high estimated risk do not. These results should be discussed with a healthcare provider.

Can this tool be used by men?

No. The Gail Model was developed and validated exclusively for women. Although men can develop breast cancer, the risk factors and statistical models differ, and no equivalent widely-validated online tool currently exists for male breast cancer risk estimation.