CHA₂DS₂-VASc Score Calculator (Stroke Risk in AF)

Stroke-risk score in non-valvular atrial fibrillation. Lip 2010 Chest. ESC/AHA recommend OAC if score ≥2 (men) / ≥3 (women).

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How to use this calculator

  • Answer each clinical question.
  • Read CHA₂DS₂-VASc total + estimated annual stroke risk.
  • Pair with HAS-BLED for bleeding risk before deciding OAC.

About this calculator

CHA₂DS₂-VASc estimates annual stroke risk in non-valvular atrial fibrillation. Source: Lip GYH et al., "Refining clinical risk stratification for predicting stroke and thromboembolism in atrial fibrillation using a novel risk factor-based approach: the Euro Heart Survey on AF." Chest 2010;137(2):263-72. Validated by Friberg L et al., Eur Heart J 2012;33:1500. Components: CHF (1), Hypertension (1), Age ≥75 (2), Diabetes (1), prior Stroke/TIA (2), Vascular disease (1), Age 65-74 (1), Sex female (1). Max 9. ESC 2024 / AHA 2023 AF guidelines: oral anticoagulation recommended at ≥2 (men) or ≥3 (women); consider at 1/2 respectively. **Not medical advice — bleeding risk (HAS-BLED) must be weighed.**

Frequently asked

Source of the score?+
Lip GYH et al., Chest 2010;137:263-72. Modification of the older CHADS₂ to capture more low-risk AF patients accurately.
Why does sex (female) add a point?+
In Friberg 2012, female sex independently increased stroke risk in AF after age 65. ESC retains this; some guidelines now treat it as a risk modifier (don't treat at score 1 if only point is sex).
CHA₂DS₂-VASc 0 — anticoagulate?+
Generally no in either sex per ESC/AHA. Annual stroke risk ~0.2% — anticoagulation harm > benefit.
Score 1 (men) / 2 (women)?+
ESC 2024: "may be considered" — case-by-case after bleeding-risk assessment. AHA 2023 similar.
Difference vs. CHADS₂?+
Original CHADS₂ (Gage 2001) had 5 components. CHA₂DS₂-VASc adds vascular disease, age 65-74 (instead of just ≥75), and female sex — better discrimination of "low risk" patients.
Is this medical advice?+
No. AF stroke prevention requires HAS-BLED + clinical context + shared decision.

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