Estimate breast cancer risk using age, family history, reproductive factors, previous breast biopsies and atypical hyperplasia.
Log in or create a free account to save your inputs and results, so you don't have to enter them again next time.🔒 No spam, ever. We never sell or share your details, and you can delete your history or account at any time. Privacy policy
Fill in the details and click Calculate to see your results.
Breast cancer risk can be influenced by several personal, reproductive and family-history factors.
This calculator combines selected risk factors to provide an educational estimate.
The result is not a diagnosis and should not replace an individual medical risk assessment.
| Current Age | 40 years |
| Race / Ethnicity | White |
| Number of Previous Breast Biopsies | None |
| History of Atypical Hyperplasia | No |
| Age at First Menstrual Period | 12-13 years |
| First-Degree Relatives with Breast Cancer | None |
| Age at First Live Birth | 20-24 years |
| Estimated 5-year risk | 0.45% |
| Risk level | Average range |
| Woman of the same age with no listed risk factors | 0.45% |
| Relative risk factor | 1× the reference level |
| Chance of NOT developing breast cancer in 5 years | 99.55% |
Estimated 5-year risk 0.45% — Average range.
| Current Age | 55 years |
| Race / Ethnicity | White |
| Number of Previous Breast Biopsies | One |
| History of Atypical Hyperplasia | No |
| Age at First Menstrual Period | 12-13 years |
| First-Degree Relatives with Breast Cancer | One |
| Age at First Live Birth | 20-24 years |
| Estimated 5-year risk | 1.31% |
| Risk level | Average range |
| Woman of the same age with no listed risk factors | 0.75% |
| Relative risk factor | 1.74× the reference level |
| Chance of NOT developing breast cancer in 5 years | 98.7% |
Estimated 5-year risk 1.31% — Average range.
A breast cancer risk calculator estimates the likelihood of developing breast cancer over a specified period using selected personal, reproductive and family-history factors.
The Relative Risk Factor is a multiplier calculated from the risk factors entered. A value of 1.00 represents the reference level used by this simplified educational calculation. Values above 1.00 indicate a higher calculated relative risk than the reference level, while values below 1.00 indicate a lower calculated relative risk.
No. The Relative Risk Factor is a multiplier, not a percentage. For example, 1.50 represents a multiplier of 1.5 relative to the reference level. The Estimated 5-Year Risk is displayed separately as a percentage.
The calculator considers age, race or ethnicity, previous breast biopsies, atypical hyperplasia, age at first menstrual period, age at first live birth and first-degree family history.
No. A risk estimate does not diagnose breast cancer. Screening and diagnostic decisions should be discussed with a qualified healthcare professional.
The 5-year risk is an estimated percentage representing the likelihood calculated by this educational model over the next five years based on the entered factors.
No. The result is for informational and educational purposes and should not replace an individual assessment by a qualified healthcare professional.