🧮 Clinical calculator · Thrombosis and cardiovascular

CHA2DS2-VASc stroke risk in atrial fibrillation

Estimates stroke risk in atrial fibrillation. The score NICE NG196 uses to frame whether anticoagulation is offered, considered or not offered.

Free to use, no account needed. Result: CHA2DS2-VASc score. Last reviewed 29 Jul 2026.

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Before you rely on the result: Not used in atrial fibrillation with a mechanical heart valve or moderate to severe mitral stenosis. NICE NG196 applies it to paroxysmal, persistent or permanent AF, to atrial flutter, and to a continuing risk of recurrence after cardioversion or ablation.

Related Ocean Article: Atrial Fibrillation (AF).

Further reading: Stroke and TIA · Palpitations · Oral Anticoagulation.

Part of the GPAtlas clinical calculators, each result explained, built by practising UK GPs.