TIMI Risk Score Calculator

Calculator

Age (years)

Adds 1 point if age is 65 or older.

CAD risk factors (count)

Adds 1 point if count is 3 or more (e.g., smoking, HTN, diabetes, dyslipidemia, family history).

Known CAD stenosis ≥50% No Yes

Prior angiographic stenosis of 50% or more.

ST-segment deviation on ECG No Yes

ST depression or transient elevation at presentation.

≥2 angina episodes in last 24 hours No Yes

Two or more anginal events in prior 24 hours.

Aspirin use in last 7 days No Yes

Regular use suggests higher baseline risk.

Elevated cardiac markers No Yes

Troponin or CK‑MB above local threshold.

Calculate Score Clear

Tip: Enter values, press calculate, then download a report if needed.

Formula Used

This tool calculates the TIMI Risk Score for UA/NSTEMI by adding 1 point for each present factor:

• Age ≥ 65 years
• At least 3 CAD risk factors
• Known CAD with stenosis ≥ 50%
• ST‑segment deviation on initial ECG
• At least 2 angina episodes in the prior 24 hours
• Aspirin use in the prior 7 days
• Elevated cardiac markers

Percentages reflect the composite endpoint used in original validation cohorts and are widely reprinted in clinical references.

How to Use

1. Confirm the patient is being assessed for UA/NSTEMI risk stratification.
2. Enter age and the count of CAD risk factors.
3. Select Yes/No for the remaining six bedside and lab features.
4. Press Calculate Score to see the score and risk estimate.
5. Use the CSV or PDF option to save or share the calculation.

Clinical context

The TIMI Risk Score is a quick bedside method used to stratify short‑term ischemic risk in patients with suspected unstable angina or non‑ST‑elevation myocardial infarction. It helps teams communicate urgency, prioritize monitoring, and support consistent triage decisions alongside ECG, biomarkers, vitals, and clinician assessment. It is not designed for STEMI pathways, and results should be interpreted within local protocols.

Inputs captured

This calculator collects seven standard elements that are usually available early in the emergency department or ward. Two fields accept numbers: patient age and the count of coronary risk factors. Typical risk factors include smoking, hypertension, diabetes, dyslipidemia, and premature family history. The remaining items are Yes/No selections for known coronary stenosis ≥50%, ECG ST‑segment deviation, recent recurrent angina, aspirin exposure, and elevated cardiac markers above the local assay threshold.

Scoring logic

Scoring is additive and transparent. One point is assigned for each positive criterion, producing a total from 0 to 7. Age contributes a point at 65 years or older, and risk factors contribute a point when three or more are present. The other five criteria each contribute one point when selected as present. Because the logic is explicit, it is easy to verify, audit, and teach at the bedside.

Interpreting the estimate

After calculation, the tool reports an estimated 14‑day composite event risk and a practical risk band. In commonly cited tables, scores 0–1 correspond to about 4.7% risk, 2 to 8.3%, 3 to 13.2%, 4 to 19.9%, 5 to 26.2%, and 6–7 to 40.9%. The composite endpoint typically includes death, myocardial infarction, or urgent revascularization. The estimate is population‑based, so local prevalence, treatment pathways, and timing of presentation can shift absolute risk.

Documentation and export

For audit and documentation, the result panel lists all inputs used to derive the score. Export buttons generate a CSV for spreadsheets and a PDF summary for chart attachment or handover. Use exports to record the context of a decision, not as a standalone justification; clinical judgment, contraindications, and institutional protocols remain essential. Recalculate when new ECG or biomarker data becomes available. Protect privacy.

FAQs

What does the TIMI Risk Score measure?

It summarizes seven clinical findings to estimate short‑term risk of death, myocardial infarction, or urgent revascularization in suspected UA/NSTEMI. It supports triage discussions, not definitive diagnosis.

Which patients is this version intended for?

This calculator follows the UA/NSTEMI TIMI score. Use it for patients with possible acute coronary syndrome without persistent ST elevation. Do not use it to replace STEMI activation or other emergency pathways.

How do I count CAD risk factors here?

Enter the number of traditional coronary risk factors present. Common examples include current smoking, hypertension, diabetes, dyslipidemia, and premature family history. Use local definitions, and count established factors rather than symptoms.

What counts as ST‑segment deviation?

Select Yes when the initial ECG shows ST depression or transient ST elevation consistent with ischemia. The exact thresholds depend on local interpretation standards, leads involved, and clinical context.

Does a high score mandate invasive management?

No. A higher score suggests greater short‑term risk, but treatment depends on symptoms, hemodynamics, comorbidities, bleeding risk, biomarker trends, and institutional protocols. Use the score as one input to shared decisions.

Can I export results for documentation?

Yes. After calculating, download a CSV for spreadsheets or a PDF summary for records or handover. Avoid sharing patient identifiers outside secure clinical systems.

Example Data Table

These scenarios are illustrative only. Always interpret results with the full clinical picture and local protocols.