Calculate your stroke risk if you have atrial fibrillation (AFib) with the CHA₂DS₂-VASc Score Calculator. This is the key tool doctors use to decide if you need blood thinners to prevent stroke.
The CHA₂DS₂-VASc Score Calculator estimates your risk of stroke if you have atrial fibrillation. AFib causes irregular heartbeats that can allow blood to pool in the heart's upper chambers, forming clots that may travel to the brain and cause a stroke.
When your heart beats irregularly, blood doesn't move through efficiently. This stagnant blood can form clots, like water pooling in a pipe. If a clot breaks free and travels to your brain, it causes a stroke.
The CHA₂DS₂-VASc Score uses validated clinical criteria developed from extensive research on stroke risk in atrial fibrillation patients. This evidence-based tool helps doctors decide if you need blood thinners to prevent stroke.
The CHA₂DS₂-VASc Score is a clinical tool that estimates your annual risk of having a stroke if you have atrial fibrillation (AFib). It helps doctors determine whether you need blood thinners (anticoagulation therapy) to prevent stroke.
Each letter represents a stroke risk factor:
C = Congestive heart failure
H = Hypertension (high blood pressure)
A₂ = Age ≥75 years (2 points)
D = DiabetesS₂ = Prior Stroke/TIA/blood clot (2 points)
V = Vascular disease (heart attack, PAD, aortic plaque)
A = Age 65-74 years
Sc = Sex category (female)
ASCVD stands for Atherosclerotic Cardiovascular Disease - conditions where plaque builds up in your arteries, leading to heart attacks and strokes.
You'll need to know: your age, sex, whether you have heart failure, high blood pressure, diabetes, history of stroke/TIA/blood clot, and vascular disease (prior heart attack, peripheral artery disease, or aortic plaque).
Score 0 (men) or 1 (women): Low risk - blood thinners may not be needed
Score 1 (men) or 2 (women): Moderate risk - discuss options with your doctor
Score ≥2 (men) or ≥3 (women): High risk - blood thinners typically recommendedYour annual stroke risk ranges from less than 1% (score 0) to over 15% (score 9) without treatment.
This calculator is specifically for people diagnosed with atrial fibrillation (AFib) or atrial flutter. If you don't have AFib, this calculator doesn't apply to you. The score helps guide treatment decisions for AFib patients only.
The CHA₂DS₂-VASc score has been validated in over 90,000 patients across multiple international studies. It's recommended by the European Society of Cardiology, American Heart Association, and American College of Cardiology as the gold standard for stroke risk assessment in AFib.
Share your score with your doctor or cardiologist. They'll discuss whether anticoagulation (blood thinners) is appropriate for you, considering both your stroke risk and bleeding risk. Never start or stop blood thinners without medical supervision.
Yes! Managing your risk factors helps reduce stroke risk.
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