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 October 16, 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. The 2020 ESC Guidelines for atrial fibrillation (Hindricks et al.) recommend it. The 2024 ESC Guidelines (Van Gelder et al.) switched to CHA₂DS₂-VA, which drops the point for female sex; because the 2020 thresholds were already one point higher for women, the resulting recommendation is the same, and this calculator’s bands match both.
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). Van Gelder IC et al. 2024 ESC Guidelines for the management of atrial fibrillation (European Heart Journal, 2024). Friberg L et al. Evaluation of risk stratification schemes for ischaemic stroke and bleeding in 182 678 patients with atrial fibrillation: the Swedish Atrial Fibrillation cohort study (European Heart Journal, 2012) — source of the annual stroke rates.
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.
More calculators
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.