TIMI Score for STEMI Calculator
HealthCalculate the TIMI Risk Score for ST-elevation MI from age, vitals, Killip class, and treatment timing, with published 30-day mortality risk by score.
Age
Diabetes, Hypertension, or Angina History (1 pt)
Systolic BP < 100 mmHg (3 pts)
Heart Rate > 100 bpm (2 pts)
Killip Class II-IV (2 pts)
Weight < 67 kg (1 pt)
Anterior ST-Elevation or New LBBB (1 pt)
Time to Treatment > 4 Hours (1 pt)
TIMI STEMI Score
0/ 14
30-Day Mortality Risk
—
Not a substitute for clinical judgment. STEMI management and triage decisions must be made by a qualified healthcare provider — this score is one input among many, never the sole basis for care.
What is a TIMI STEMI?
The TIMI Score for STEMI Calculator computes the TIMI Risk Score for ST-elevation myocardial infarction, a validated tool that estimates 30-day mortality risk based on age, vital signs, Killip class, weight, ECG findings, and treatment timing. The score ranges from 0 to 14 points.
Select the applicable factors to see your total score and the corresponding published 30-day mortality risk. For related acute coronary syndrome risk tools, see the GRACE Calculator, HEART Score Calculator, and TIMI Score Calculator for UA/NSTEMI.
How to use this TIMI STEMI calculator
- Select the applicable Age category: under 65, 65-74, or 75 and above.
- Select Yes or No for Diabetes, Hypertension, or Angina History.
- Select Yes or No for Systolic BP < 100 mmHg.
- Select Yes or No for Heart Rate > 100 bpm.
- Select Yes or No for Killip Class II-IV.
- Select Yes or No for Weight < 67 kg.
- Select Yes or No for Anterior ST-Elevation or New LBBB.
- Select Yes or No for Time to Treatment > 4 Hours.
- Review your TIMI STEMI Score and 30-Day Mortality Risk, and discuss the result with your care team.
Formula & Methodology
The TIMI STEMI score sums the following points: - Age 65-74: 2 points; age ≥75: 3 points - Diabetes, hypertension, or angina history: 1 point - Systolic BP < 100 mmHg: 3 points - Heart rate > 100 bpm: 2 points - Killip class II-IV: 2 points - Weight < 67 kg: 1 point - Anterior ST-elevation or new LBBB: 1 point - Time to treatment > 4 hours: 1 point Published 30-day mortality by score (Morrow DA, et al. Circulation. 2000;102:2031-2037): 0 → 0.8%, 1 → 1.6%, 2 → 2.2%, 3 → 4.4%, 4 → 7.3%, 5 → 12.4%, 6 → 16.1%, 7 → 23.4%, 8 → 26.8%, >8 → 35.9%. Worked example: A 78-year-old patient (3 points) with a heart rate of 110 bpm (2 points) and Killip class II (2 points) scores 3 + 2 + 2 = 7 points total, corresponding to an estimated 30-day mortality risk of approximately 23.4%.
Frequently Asked Questions
The TIMI Risk Score for ST-elevation myocardial infarction (STEMI) is a validated clinical tool that estimates 30-day mortality risk after a STEMI, based on a weighted combination of age, vital signs, Killip class, and treatment timing. It was developed by Morrow DA, et al. and published in Circulation in 2000.
The factors are: age (3 points for 75+, 2 points for 65-74), diabetes/hypertension/angina history (1 point), systolic BP under 100 mmHg (3 points), heart rate over 100 bpm (2 points), Killip class II-IV (2 points), weight under 67 kg (1 point), anterior ST-elevation or new LBBB (1 point), and time to treatment over 4 hours (1 point), for a maximum of 14 points.
Each total score maps to a published 30-day mortality percentage from the original derivation cohort — for example, a score of 0 corresponds to about 0.8% mortality, while a score of 8 or higher corresponds to well over 25%. Higher scores indicate substantially higher estimated mortality risk.
Killip class is a clinical classification of heart failure severity at the time of a myocardial infarction, ranging from Class I (no heart failure signs) to Class IV (cardiogenic shock). Classes II through IV indicate at least some degree of heart failure and add 2 points to the TIMI STEMI score.
Time to treatment reflects how quickly reperfusion therapy (such as primary PCI or fibrinolysis) was delivered after symptom onset — longer delays are associated with more myocardial damage and worse outcomes, which is why treatment beyond 4 hours adds a point to the score.
The score is often used to communicate prognosis and to help identify higher-risk patients who may need more intensive monitoring or follow-up, but specific management and treatment decisions are always made by the treating cardiology team based on the complete clinical picture.
No — they are separate, differently weighted scores for different acute coronary syndrome presentations. The TIMI UA/NSTEMI Calculator uses seven equally weighted binary criteria and estimates a different endpoint (14-day risk of death, MI, or urgent revascularization) rather than 30-day mortality.
It was derived and validated using data from large randomized fibrinolytic therapy trials in STEMI patients, with the resulting scoring system and mortality table published by Morrow DA, et al. in Circulation, 2000;102:2031-2037.
No — a low score indicates a lower estimated population-level mortality risk compared to higher scores, but it does not eliminate the risk of complications in an individual patient, and close monitoring by the care team remains essential regardless of score.
The GRACE Calculator uses a different, more granular set of predictors and is validated across the full spectrum of acute coronary syndromes, while the TIMI STEMI score uses fewer, simpler binary and categorical inputs specific to STEMI — both are used in clinical practice, sometimes together.
No — this calculator is strictly for informational and educational purposes only. STEMI is a time-critical, life-threatening emergency, and all diagnostic and treatment decisions must be made immediately by a qualified healthcare provider — this tool must never delay or substitute for that care.
Emergency physicians, cardiologists, and trainees use it primarily for prognostic communication and risk stratification research, while patients or families may encounter it as part of understanding a physician's explanation of expected recovery risk after a STEMI.
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