About this calculator
The CHA₂DS₂-VASc score is used to summarize common stroke-risk factors in people with atrial fibrillation. This calculator shows the component score only and does not start, stop, or recommend anticoagulation.
CHA₂DS₂-VASc assigns points for congestive heart failure/LV dysfunction, hypertension, age, diabetes, stroke/TIA/systemic embolism, vascular disease, and sex category.
Source-mapped clinical score for education
CHA₂DS₂-VASc estimates stroke-risk category in atrial fibrillation but does not decide anticoagulation by itself.
Formula and method
CHF/LV dysfunction 1, hypertension 1, age 65–74 1, age ≥75 2, diabetes 1, prior stroke/TIA/systemic embolism 2, vascular disease 1, female sex category 1.
Limitations and when not to rely on this result
- CHA₂DS₂-VASc estimates stroke-risk category in atrial fibrillation but does not decide anticoagulation by itself.
- Bleeding risk, patient preferences, valve disease, kidney function, drug interactions, fall risk, procedures, and local guidelines matter.
- Do not use this page as the only basis to start, stop, or change anticoagulation.
Frequently asked questions
Who is CHA₂DS₂-VASc for? +
It is used for stroke-risk stratification in people with atrial fibrillation or atrial flutter, not as a general-population screening tool.
Does the score decide anticoagulation automatically? +
No. Guidelines use the score as one part of shared clinical decision-making together with bleeding risk and patient factors.
Why does age count twice at 75 or older? +
Age is a strong stroke-risk factor in atrial fibrillation, so age 75 or older contributes 2 points.
Does female sex alone mean high risk? +
No. Female sex category alone should not be interpreted as high risk without other stroke-risk factors.
Should I stop anticoagulation if my score is low? +
No. Medication decisions should be made with a clinician who knows your full history and bleeding risk.