🫀 CHA₂DS₂‑VASc Score Calculator

Stroke risk assessment for non‑valvular atrial fibrillation – used by clinicians worldwide
100% client‑side, private, no data stored.

📊 Stroke risk prediction 🩺 Evidence‑based 🔒 No patient data stored

Patient Risk Factors

❤️ Congestive heart failure (or LV dysfunction)

🩸 Hypertension

🍬 Diabetes mellitus

🧠 Prior stroke / TIA / thromboembolism (2 points)

🩻 Vascular disease (prior MI, PAD, aortic plaque)

👤 Demographics

📅 Age ≥ 75 years (2 points)

📅 Age 65–74 years (1 point)

If age ≥ 75, check the box above instead.

♀️ Female sex (1 point if age ≥ 65 or additional risk factor)

CHA₂DS₂‑VASc Score

Low risk

📊 Annual Stroke Risk (without anticoagulation)

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Based on large cohort studies (Lip et al., 2010; Friberg et al., 2012)

🩺 Clinical Recommendation

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Per ESC 2020 / ACC 2019 guidelines

📖 What is the CHA₂DS₂‑VASc Score?

The CHA₂DS₂‑VASc score is a clinical prediction tool for estimating the risk of ischemic stroke in patients with non‑valvular atrial fibrillation (AFib). It helps clinicians decide whether anticoagulation therapy is beneficial.

Score components:

C – Congestive heart failure (1 point)
H – Hypertension (1 point)
A₂ – Age ≥ 75 years (2 points)
D – Diabetes mellitus (1 point)
S₂ – Prior stroke / TIA / thromboembolism (2 points)
V – Vascular disease (1 point)
A – Age 65–74 years (1 point)
Sc – Female sex (1 point, only when combined with other risk factors)

✨ Clinical Utility

Score 0 in males / Score 1 in females → Low risk, no anticoagulation usually recommended.
Score ≥ 2 → Consider oral anticoagulation (direct oral anticoagulants or warfarin).
Used daily by cardiologists, neurologists, emergency physicians, and general practitioners.
Validated in multiple large cohorts.

All calculations are performed locally in your browser – patient data never leaves your device.

💡 Evidence Base

The score was derived from the Euro Heart Survey on AF and validated in multiple populations. For a CHA₂DS₂‑VASc score of 0 in males, the adjusted stroke rate is 0%–0.78% per year. For score ≥ 2, annual stroke risk can exceed 6% without anticoagulation.

❓ Frequently Asked Questions

CHA₂DS₂‑VASc adds additional risk factors (vascular disease, age 65–74, female sex) and has better discrimination for patients at truly low risk. It is now the preferred score in international guidelines.

Current guidelines (ESC 2020, ACC 2019) recommend oral anticoagulation for males with CHA₂DS₂‑VASc ≥ 2 and females with score ≥ 3. For score 1 in males or 2 in females, consider anticoagulation after shared decision‑making. This tool provides general recommendations – always use clinical judgment.

No. All calculations are client‑side. No information is sent to any server. Your patients’ data remains private.