CHA₂DS₂-VASc Score Calculator (AFib Stroke Risk)
The CHA₂DS₂-VASc score estimates annual ischaemic stroke and systemic embolism risk in non-valvular atrial fibrillation. It assigns one or two points to congestive heart failure, hypertension, age, diabetes, prior stroke or thromboembolism, vascular disease, and sex category, for a total of 0–9. The ACC/AHA/HRS 2019 atrial fibrillation focused update incorporates CHA₂DS₂-VASc as the standard stratification tool for selecting patients who may benefit from oral anticoagulation. The score does not by itself dictate therapy — it is a decision-support input that clinicians integrate with bleeding risk, comorbid burden, valve status, and patient preferences.
This tool is for educational and decision-support use only. It does not replace independent clinical judgement. Always verify against the current guideline, FDA label, or specialty reference cited below before acting. Do not enter patient identifiers (name, MRN, dates of service).
Tool
Who this is for
- Internal medicine and cardiology residents managing AF on rounds
- Hospitalists and emergency physicians making acute decisions
- Primary care attendings and APPs evaluating chronic AF
How to interpret the result
| Score / band | Interpretation |
|---|---|
| 0 | Low — anticoagulation often not recommended (men); women without other risk factors may also defer. |
| 1 | Borderline — guidelines suggest considering anticoagulation (men); discuss benefits and bleeding risk. |
| ≥ 2 (men) / ≥ 3 (women) | Anticoagulation is typically recommended pending bleeding risk assessment. |