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 August 31, 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).
Frequently asked questions
- What is a good CHA₂DS₂-VASc score?
- A lower score means a lower estimated stroke risk. A score of 0 in men (or 1 in women, where the point comes only from sex) is considered low risk, and guidelines generally do not recommend anticoagulation. This is educational only — discuss your result with your doctor.
- Does a CHA₂DS₂-VASc score mean I need blood thinners?
- Not by itself. The score estimates stroke risk and informs the conversation, but the decision to start an oral anticoagulant also weighs your bleeding risk, preferences, and other conditions. Only a clinician can make that recommendation.
- Why does being female add a point?
- Female sex is treated as a risk modifier rather than an independent risk factor. In practice, a score of 1 in a woman driven only by sex is still considered low risk. The point matters mainly when combined with other factors.
- What is the difference between CHADS₂ and CHA₂DS₂-VASc?
- CHA₂DS₂-VASc adds age 65–74, vascular disease, and female sex to the older CHADS₂ score. It is better at identifying patients who are truly low risk, which is why the 2020 ESC Guidelines recommend it.
- Does this calculator apply to valvular atrial fibrillation?
- No. The CHA₂DS₂-VASc score is validated for non-valvular atrial fibrillation. Patients with moderate-to-severe mitral stenosis or a mechanical heart valve need anticoagulation regardless of the score.
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Keep exploring helpful tools
HAS-BLED (bleeding risk)
Estimates bleeding risk on anticoagulation in AFib (Pisters 2010).
10-year cardiovascular risk
Heart attack & stroke probability over 10 years (ACC/AHA equations).
Blood pressure
Classify your blood pressure using AHA 2017 guidelines.
Cholesterol ratio
TC/HDL, LDL/HDL and non-HDL ratios with AHA/ACC 2018 classification.