CHA₂DS₂-VASc Atrial Fibrillation Risk Factor Point Tally Calculator

Tally CHA₂DS₂-VASc clinical points and reference annual thromboembolic event rates.

CHA₂DS₂-VASc Total Score
4 points
Cohort Unadjusted Annual Stroke Risk 4.8 %/yr
Points from 2-Point Factors 2 pts
Points from 1-Point Factors 2 pts
Inputs
factors (×2 pts)
Count of 2-point factors (Prior Stroke/TIA/TE [2 pts], Age ≥75 [2 pts], 0 to 2).
factors (×1 pt)
Count of 1-point factors (CHF, HTN, Diabetes, Vascular disease, Age 65–74, Sc, 0 to 6).
Results & Graph
CHA₂DS₂-VASc Total Score
4 points
Cohort Unadjusted Annual Stroke Risk
4.8 %/yr
Points from 2-Point Factors
2 pts
Points from 1-Point Factors
2 pts

CHA₂DS₂-VASc Total Score

Graph 1 • Major Two Point Factors Count Sensitivity Recalculates the domain equation across 50% to 150% of the primary input while holding other parameters constant.
0 points 3.2 points 6.5 points 50%: 4 points 4 50% 75%: 4 points 4 75% 100%: 4 points 4 100% 125%: 4 points 4 125% 150%: 6 points 6 150%
Graph 2 • Primary & Supporting Metric Comparison Compares the primary output alongside supporting domain benchmarks.
CHA₂DS₂-VASc Total Score 4 points Cohort Unadjusted Annual Stroke Risk 4.8 %/yr Points from 2-Point Factors 2 pts Points from 1-Point Factors 2 pts
Graph 3 • Exact Output Table & Units Displays each calculated output in its exact domain unit.
CHA₂DS₂-VASc Total Score4 pointsCohort Unadjusted Annual Stroke Risk4.8 %/yrPoints from 2-Point Factors2 ptsPoints from 1-Point Factors2 pts
Summary: Total CHA₂DS₂-VASc score is 4/9, corresponding to a published unadjusted cohort stroke rate of ~4.8%/year.
Summary: Total CHA₂DS₂-VASc score is 4/9, corresponding to a published unadjusted cohort stroke rate of ~4.8%/year.
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Formula & Mathematical Methodology: CHA₂DS₂-VASc Score Reference Equation

Score = CHF(1) + HTN(1) + Age≥75(2) + DM(1) + Stroke/TIA(2) + Vascular(1) + Age65-74(1) + SexCategory(1)
Score = CHF(1) + HTN(1) + Age≥75(2) + DM(1) + Stroke/TIA(2) + Vascular(1) + Age65-74(1) + SexCategory(1)
  • majorTwoPointFactorsCount: Major Two Point Factors Count (factors (×2 pts))
  • singlePointFactorsCount: Single Point Factors Count (factors (×1 pt))

Rounding: Laboratory and clinical equations retain full floating-point precision and round displayed results to 2 decimal places.

Worked Example: Reference Calculation: CHA₂DS₂-VASc Score

Tally CHA₂DS₂-VASc clinical points and reference annual thromboembolic event rates.

  1. Enter the reagent concentrations, assay readings, or clinical laboratory parameters.
  2. Compute the standard formula: Score = CHF(1) + HTN(1) + Age≥75(2) + DM(1) + Stroke/TIA(2) + Vascular(1) + Age65-74(1) + SexCategory(1).
  3. Review the primary result, supporting reference intervals, and 3 SVG visualizations.
Result: Evaluates CHA₂DS₂-VASc Score via Score = CHF(1) + HTN(1) + Age≥75(2) + DM(1) + Stroke/TIA(2) + Vascular(1) + Age65-74(1) + SexCategory(1).

Frequently Asked Questions

What formula is used by the CHA₂DS₂-VASc Atrial Fibrillation Risk Factor Point Tally Calculator?

It computes Score = CHF(1) + HTN(1) + Age≥75(2) + DM(1) + Stroke/TIA(2) + Vascular(1) + Age65-74(1) + SexCategory(1) and plots three custom SVG graphs showing parameter sensitivity and component breakdowns.

Can I compare different reagent dilutions or lab scenarios side by side?

Yes. Use the "Compare (0/3)" button to pin up to 3 scenarios side by side.

Are entered values stored on any server?

No. Every calculation runs 100% locally in your browser.

Health & Fitness · Clinical Diagnostics & Scoring

CHA₂DS₂-VASc Atrial Fibrillation Risk Factor Point Tally Calculator: inputs, method, and how to read the result

Tally CHA₂DS₂-VASc clinical points and reference annual thromboembolic event rates.

Choose inputs for the case you are checking

The defaults are illustrative. Replace them with values for your case and keep the units shown beside each field.

  • Major Two Point Factors Count: Count of 2-point factors (Prior Stroke/TIA/TE [2 pts], Age ≥75 [2 pts], 0 to 2).
  • Single Point Factors Count: Count of 1-point factors (CHF, HTN, Diabetes, Vascular disease, Age 65–74, Sc, 0 to 6).

What the calculation includes

With the default values shown, CHA₂DS₂-VASc Total Score is 4 points. The calculation follows CHA₂DS₂-VASc Score Reference Equation; the formula and variable definitions above show how the inputs combine.

A question to settle before using the estimate

What formula is used by the CHA₂DS₂-VASc Atrial Fibrillation Risk Factor Point Tally Calculator? It computes Score = CHF(1) + HTN(1) + Age≥75(2) + DM(1) + Stroke/TIA(2) + Vascular(1) + Age65-74(1) + SexCategory(1) and plots three custom SVG graphs showing parameter sensitivity and component breakdowns.

Where to use caution

  • Uses standard IUPAC atomic weights, 25°C (298.15 K) reference thermodynamics, and published clinical literature equations.
  • Educational and laboratory reference tool only; clinical scoring calculators do not replace professional medical judgment or institutional protocols.

Scope: IUPAC / NIH Laboratory & Clinical Reference Standard Check the assumptions and limitations against your situation before relying on the estimate.

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