CHA₂DS₂-VASc Score Calculator — AFib Stroke Risk
Free CHA₂DS₂-VASc calculator estimating stroke risk in non-valvular atrial fibrillation. Instant score 0–9 with an educational guideline interpretation.
CalcVita. (2026). CHA₂DS₂-VASc Score Calculator — AFib Stroke Risk. CalcVita. Retrieved June 3, 2026, from https://calcvita.com/en/calculators/cha2ds2-vasc
Suggested article
AFib Stroke vs Bleeding Risk: CHA₂DS₂-VASc & HAS-BLED
In atrial fibrillation, the same blood thinner that prevents a stroke can also cause a bleed. Two scores — CHA₂DS₂-VASc and HAS-BLED — put both sides of that decision into numbers.
Read the full article →What the CHA₂DS₂-VASc score is
The CHA₂DS₂-VASc score estimates the risk of stroke in people with non-valvular atrial fibrillation (AFib). It was introduced by Lip and colleagues (Chest, 2010) to refine the older CHADS₂ score and better identify patients who are genuinely at low risk. Today it is the risk-stratification tool recommended in the 2020 ESC Guidelines for atrial fibrillation (Hindricks et al.).
How the points are calculated
The acronym sums clinical risk factors: Congestive heart failure (1 point), Hypertension (1), Age 65–74 (1) or Age ≥75 (2, hence the subscript 2), Diabetes (1), prior Stroke/TIA/thromboembolism (2), Vascular disease such as prior heart attack or peripheral artery disease (1), and female Sex category (1). The total ranges from 0 to 9.
What the result bands mean
These bands are educational, not a prescription. Low risk: guidelines do not recommend anticoagulation. Anticoagulation may be considered: an individualised decision balancing stroke and bleeding risk. Oral anticoagulation recommended: guidelines recommend a blood thinner for most patients in this range. Only your doctor can decide on treatment, weighing your bleeding risk too (often with a tool such as HAS-BLED).
Sources
Lip GYH et al. Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the CHA₂DS₂-VASc score (Chest, 2010). Hindricks G et al. 2020 ESC Guidelines for the diagnosis and management of atrial fibrillation (European Heart Journal, 2021).
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