Framingham Risk Score Calculator
Estimate your 10-year risk of a cardiovascular event using key lab and clinical values. Used by clinicians and patients to guide decisions about statin therapy, lifestyle change, and preventive care.
About this calculator
The Framingham Risk Score estimates the probability of a cardiovascular event (heart attack or stroke) within the next 10 years based on age, cholesterol levels, blood pressure, and other factors. This calculator uses a simplified continuous approximation: Risk (%) = (age − 30) × 0.5 + (total cholesterol − 150) × 0.02 + (150 − HDL) × 0.1 + (systolic BP − 100) × 0.05, clamped between 1% and 30%. Each term captures a known independent risk factor: older age, higher LDL-raising cholesterol, lower protective HDL, and elevated blood pressure all increase risk additively. The original Framingham study followed thousands of residents of Framingham, Massachusetts over decades to derive population-level risk coefficients. Results are categorized as low (<10%), intermediate (10–20%), or high (>20%), which directly informs treatment guidelines.
How to use
Take a 55-year-old with total cholesterol 210 mg/dL, HDL 45 mg/dL, and systolic BP 130 mmHg. Step 1: Age term = (55 − 30) × 0.5 = 12.5. Step 2: Cholesterol term = (210 − 150) × 0.02 = 1.2. Step 3: HDL term = (150 − 45) × 0.1 = 10.5. Step 4: BP term = (130 − 100) × 0.05 = 1.5. Step 5: Sum = 12.5 + 1.2 + 10.5 + 1.5 = 25.7%. Clamped to max 30%, this patient's estimated 10-year cardiovascular risk is 25.7% — high risk, suggesting strong consideration of statin therapy and lifestyle modification.
Frequently asked questions
What cholesterol and blood pressure levels significantly increase Framingham risk score?
Total cholesterol above 200 mg/dL begins to add meaningful risk points, and values above 240 mg/dL (hypercholesterolemia) contribute substantially. HDL below 40 mg/dL is a major risk amplifier because low HDL is independently associated with atherosclerosis. For blood pressure, each 10 mmHg rise in systolic pressure above 100 mmHg adds 0.5 percentage points to your estimated risk in this model. Optimizing both cholesterol (through diet, exercise, or statins) and blood pressure (through medication or weight loss) can significantly lower your calculated 10-year risk.
How is the Framingham Risk Score used to decide whether to start statin therapy?
Current ACC/AHA guidelines recommend statins for patients with a 10-year ASCVD risk ≥ 10% who do not already have cardiovascular disease. Intermediate-risk patients (7.5–20%) are often the primary target for a clinician–patient discussion about whether to initiate therapy. High-risk patients (>20%) are generally recommended for high-intensity statin therapy. The risk score is a starting point, not a final decision — clinicians also consider family history, inflammatory markers like CRP, coronary artery calcium scores, and patient preferences before prescribing.
What are the limitations of using the Framingham Risk Score for non-white populations?
The original Framingham cohort was predominantly white and middle-class, which limits generalizability to other ethnic groups. Studies have shown the score tends to overestimate risk in some Asian populations and may underestimate risk in South Asians and certain African American subgroups. The ACC/AHA Pooled Cohort Equations were developed partly to address this gap, incorporating data from more diverse cohorts. For clinical use in diverse populations, the Framingham score should be supplemented with ethnicity-specific considerations and, where available, more validated multi-ethnic tools.