Stroke Risk Calculators – Quick Online Assessment
Stroke Risk Calculator
CHA₂DS₂-VASc Score for Atrial Fibrillation
A stroke occurs every 40 seconds in the United States, yet up to 80% of premature strokes are preventable through risk identification and proactive lifestyle changes.
If you or a loved one has been diagnosed with Atrial Fibrillation (AFib)—or if you want to understand your cardiovascular baseline—our quick assessment tool below calculates your estimated annual stroke risk using the CHA2DS2-VASc clinical model.
What Is the CHA2DS2-VASc Score?
The CHA2DS2-VASc score is the standard clinical scoring system recommended by the American College of Cardiology (ACC) and the American Heart Association (AHA). It evaluates risk factors in patients with non-valvular atrial fibrillation to determine whether blood-thinning medications (anticoagulants) are warranted.
How the Score Is Calculated
Each clinical factor adds points to your total:
| Letter | Clinical Characteristic | Points Awarded |
| C | Congestive Heart Failure (or left ventricular dysfunction) | +1 |
| H | Hypertension (high blood pressure, treated or untreated) | +1 |
| A2 | Age 75 or older | +2 |
| D | Diabetes Mellitus | +1 |
| S2 | Prior Stroke, TIA (mini-stroke), or thromboembolism | +2 |
| V | Vascular Disease (prior heart attack, peripheral artery disease, or aortic plaque) | +1 |
| A | Age 65 to 74 | +1 |
| Sc | Sex Category: Female | +1 |
What Does Your Score Mean?
Your total score translates directly into an adjusted annual stroke risk percentage:
| CHA2DS2-VASc Score | Annual Adjusted Stroke Risk | Standard AHA/ACC Guideline Recommendation |
| 0 | 0.2% – 0.3% (Low Risk) | No antithrombotic therapy typically required. |
| 1 | 0.6% – 1.3% (Intermediate Risk) | Oral anticoagulation or clinical monitoring may be considered based on shared decision-making. |
| 2 | 2.2% (High Risk) | Oral anticoagulant therapy (e.g., DOACs like apixaban/rivaroxaban or warfarin) is strongly recommended. |
| 3 | 3.2% (High Risk) | Anticoagulation strongly recommended. |
| 4 | 4.0% (High Risk) | Anticoagulation strongly recommended. |
| 5 | 6.7% (High Risk) | Anticoagulation strongly recommended. |
| 6 | 9.8% (Very High Risk) | Anticoagulation strongly recommended. |
| 7+ | 9.6% – 15.2% (Very High Risk) | Immediate medical consultation and ongoing anticoagulation management. |
Primary Modifiable Risk Factors
While genetics and age cannot be altered, the majority of stroke risk is tied to conditions you can actively manage:
High Blood Pressure (Hypertension): The single most critical controllable factor. Keeping systolic pressure below 120/80 mmHg preserves delicate blood vessels in the brain.
Elevated LDL Cholesterol: Plaque buildup (atherosclerosis) narrows carotid arteries, raising the likelihood of clot formation.
Uncontrolled Blood Sugar: Diabetes damages blood vessels over time, doubling stroke likelihood.
Tobacco & Nicotine Use: Smoking promotes clot formation, thickens blood, and accelerates arterial narrowing.
Sedentary Lifestyle & Obesity: At least 150 minutes of moderate-intensity aerobic exercise per week improves circulation and reduces AFib episodes.
Learn to Act: Spot a Stroke with B.E. F.A.S.T.
Stroke is a time-critical emergency where rapid treatment with clot-busting medications (like thrombolytics) or mechanical thrombectomy can save millions of neurons:
| Letter | Warning Sign | What to Check |
| B | Balance | Sudden loss of balance, trouble walking, or severe dizziness |
| E | Eyes | Sudden vision loss or double vision in one or both eyes |
| F | Face | Uneven smile or one side of the face drooping |
| A | Arms | One arm drifting downward when both are raised |
| S | Speech | Slurred speech or difficulty finding/repeating words |
| T | Time to call 911 | Call emergency medical services immediately—do not drive yourself |
Disclaimer: This assessment and overview are for informational and educational purposes only and do not replace personalized evaluation by a board-certified physician or neurologist. Never initiate, stop, or change prescribed anticoagulant therapies without consulting your doctor.