CHADS2 Score (AF stroke risk)
CHADS2 stroke-risk score (Gage 2001): CHF (1) + hypertension (1) + age ≥ 75 (1) + diabetes (1) + prior stroke/TIA (2); total 0-6 mapped to the adjusted annual ischemic-stroke rate.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Hypertension
- Yes
Result: CHADS2 1/6: adjusted annual stroke rate 2.8%/yr (Gage 2001 derivation cohort).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Score 0-6
- CHF (1), hypertension (1), age >= 75 (1), diabetes (1), prior stroke/TIA (2). Adjusted annual stroke rate 0 = 1.9%/yr to 6 = 18.2%/yr.
- Use
- superseded by CHA2DS2-VASc / the 2024 ESC CHA2DS2-VA for routine use; shown for the migration. Cross-links chads, cha2ds2-va, chads-65.
What you enter
- Congestive heart failure
- Hypertension
- Age ≥ 75
- Diabetes mellitus
- Prior stroke or TIA
How this is calculated
Gage BF, Waterman AD, Shannon W, et al. Validation of clinical classification schemes for predicting stroke: results from the National Registry of Atrial Fibrillation. JAMA. 2001;285(22):2864-2870. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.