What does the CHA₂DS₂-VASc score measure?

It estimates stroke risk in people with non-valvular atrial fibrillation and helps inform anticoagulation discussions.

What is the maximum CHA₂DS₂-VASc score?

The range is 0–9 for women and 0–8 for men.

Does female sex alone require anticoagulation?

No. Female sex alone is treated as a score of 0 for anticoagulation decisions.

When is oral anticoagulation generally recommended?

The tool identifies men with scores of at least 2 and women with scores of at least 3 as candidates for recommended oral anticoagulation, with a DOAC preferred over warfarin.

Is this calculator medical advice?

No. Use the result with bleeding-risk assessment, such as HAS-BLED, clinician judgment, and shared decision-making.

CHA₂DS₂-VASc Score (AFib Stroke Risk) | Online Free Tool

CHA₂DS₂-VASc Score (AFib Stroke Risk) | Online Free Tool | Elysia Tools

Execution

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Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

75-year-old woman, HTN, prior TIA → score 6, recommend OAC

A(≥75)=2 + Sc=1 + H=1 + S₂(stroke/TIA)=2 → total 6. Female ≥3 → recommend oral anticoagulation (DOAC preferred). Approx. annual stroke risk ~13.6%.

{"result":"CHA₂DS₂-VASc total 6. Recommend oral anticoagulation (DOAC preferred over warfarin). Approx. annual stroke risk ~13.6%.","metadata":{"input":{"ageGroup":"gte75","sex":"female","chf":false,"hypertension":true,"diabetes":false,"stroke":true,"vascular":false},"result":{"total":6,"components":{"age":2,"sex":1,"chf":0,"hypertension":1,"diabetes":0,"stroke":2,"vascular":0},"sexOnlyPoint":false,"annualStrokeRiskPercent":13.6,"recommendation":{"category":"Recommend anticoagulation","recommendation":"Recommend oral anticoagulation; DOAC preferred over warfarin."},"method":"CHA₂DS₂-VASc (Lip 2010 Chest; 2023 ACC/AHA/ACCP/HRS)","model":"Lip GY et al. Chest 2010;137(2):263-272. Not medical advice."}}}

65-year-old man, no risk factors → score 1, consider OAC

A(65–74)=1. Male 1 → consider anticoagulation (shared decision). Approx. annual stroke risk ~0.6%.

{"result":"CHA₂DS₂-VASc total 1. Consider oral anticoagulation (DOAC preferred) using shared decision-making. Approx. annual stroke risk ~0.6%.","metadata":{"input":{"ageGroup":"65to74","sex":"male","chf":false,"hypertension":false,"diabetes":false,"stroke":false,"vascular":false},"result":{"total":1,"components":{"age":1,"sex":0,"chf":0,"hypertension":0,"diabetes":0,"stroke":0,"vascular":0},"sexOnlyPoint":false,"annualStrokeRiskPercent":0.6,"recommendation":{"category":"Consider anticoagulation","recommendation":"Consider oral anticoagulation (DOAC preferred over warfarin) using shared decision-making, balanced against bleeding risk (HAS-BLED) and patient preference."},"method":"CHA₂DS₂-VASc (Lip 2010 Chest; 2023 ACC/AHA/ACCP/HRS)","model":"Lip GY et al. Chest 2010;137(2):263-272. Not medical advice."}}}

Inputs

Set the required fields, then run the tool.

7 options

SettingsAdjust formats, ranges, numbers, and modes.2

AgeselectRequiredAge band. <65 scores 0; 65–74 scores 1; ≥75 scores 2.SexselectRequiredBiological sex. Female scores +1 (sex category). Female sex alone does NOT trigger anticoagulation.

TogglesEnable or disable optional behavior.5

Congestive heart failure / LV dysfunctioncheckboxOptionalEnabled when checkedCongestive heart failure or left ventricular dysfunction. +1 if present.HypertensioncheckboxOptionalEnabled when checkedHypertension (treated or untreated). +1 if present.Diabetes mellituscheckboxOptionalEnabled when checkedDiabetes mellitus. +1 if present.Prior stroke / TIA / thromboembolismcheckboxOptionalEnabled when checkedPrior ischemic stroke, TIA, or systemic thromboembolism. +2 if present.Vascular disease (prior MI, PAD, aortic plaque)checkboxOptionalEnabled when checkedPrior myocardial infarction, peripheral artery disease, or aortic atherosclerotic plaque. +1 if present.

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

2 examples

75-year-old woman, HTN, prior TIA → score 6, recommend OAC

A(≥75)=2 + Sc=1 + H=1 + S₂(stroke/TIA)=2 → total 6. Female ≥3 → recommend oral anticoagulation (DOAC preferred). Approx. annual stroke risk ~13.6%.

65-year-old man, no risk factors → score 1, consider OAC

A(65–74)=1. Male 1 → consider anticoagulation (shared decision). Approx. annual stroke risk ~0.6%.

Inputs

Set the required fields, then run the tool.

7 options

SettingsAdjust formats, ranges, numbers, and modes.2

AgeselectRequiredAge band. <65 scores 0; 65–74 scores 1; ≥75 scores 2.SexselectRequiredBiological sex. Female scores +1 (sex category). Female sex alone does NOT trigger anticoagulation.

TogglesEnable or disable optional behavior.5

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Examples

1. Older woman with hypertension and prior TIA

Cardiology clinician

Background

A 75-year-old woman with non-valvular atrial fibrillation has hypertension and a prior transient ischemic attack.

Problem

Calculate her CHA₂DS₂-VASc score and identify the anticoagulation discussion category.

How to use

Select age ≥75 years and female, then mark hypertension and prior stroke/TIA/thromboembolism.

{"ageGroup":"gte75","sex":"female","chf":false,"hypertension":true,"diabetes":false,"stroke":true,"vascular":false}

Outcome

The score is 6. The tool recommends oral anticoagulation, preferably a DOAC over warfarin, and reports an approximate annual stroke risk of 13.6%.

2. Man aged 65–74 with no additional risk factors

Primary care clinician

Background

A 65-year-old man with non-valvular atrial fibrillation has no recorded heart failure, hypertension, diabetes, prior stroke or TIA, thromboembolism, or vascular disease.

Problem

Determine whether anticoagulation should be considered based on the score.

How to use

Select age 65–74 years and male, leaving all condition checkboxes unselected.

{"ageGroup":"65to74","sex":"male","chf":false,"hypertension":false,"diabetes":false,"stroke":false,"vascular":false}

Outcome

The score is 1. The tool indicates that oral anticoagulation may be considered using shared decision-making and reports an approximate annual stroke risk of 0.6%.

CHA₂DS₂-VASc Score (AFib Stroke Risk)

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Examples

1. Older woman with hypertension and prior TIA

2. Man aged 65–74 with no additional risk factors

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