TIMI Risk Score (STEMI) Calculator


TIMI Risk Score (STEMI) Calculator
Diabetes, Hypertension or Angina
Systolic BP < 100 mmHg
Heart rate > 100
Killip Class II-IV JVD or any pulmonary exam findings of CHF
Weight < 67kg (147.7 lbs)
Anterior ST Elevation or LBBB
Time to treatment > 4 hours

Alright folks, let’s dive into the exciting world of TIMI Risk Score (STEMI) calculation! No, this is not about Timmy from the hit cartoon ‘Fairly Odd Parents,’ but it’s equally as magical!

Calculation Formula

The formula for TIMI Risk Score (STEMI) is as follows:

score = (Age/10) + (Number of coronary artery disease (CAD) risk factors) + (2 if Killip class > 1) + (2 if systolic blood pressure < 100 mmHg) + (3 if heart rate > 100 bpm) + (2 if weight < 67 kg)

Categories / Types / Range / Levels

Category Score Range Interpretation
Low Risk 0 – 2 Lower chances of adverse events
Intermediate Risk 3 – 4 Moderate chances of adverse events
High Risk 5 – 14 Higher chances of adverse events

Examples of Calculations

Name Age CAD Factors Killip Class Systolic BP Heart Rate Weight Calculation
John 50 2 1 120 90 70 7
Jane 60 3 2 90 100 65 12

Evolution Over Time

Year Development
1985 Initial concept
1996 First use in clinical practice
2000 Extended use in STEMI


  1. Age bias: Older individuals may score higher merely due to age.
  2. Weight bias: The calculation may be biased against individuals with lower body weight.
  3. Lack of certain factors: The score does not account for all possible risk factors.

Alternatives to TIMI

Method Advantages Disadvantages
GRACE More comprehensive More complex


  1. What is the TIMI Risk Score? The TIMI Risk Score is a tool used to predict the risk of death, myocardial infarction, or need for revascularization in patients with unstable angina or non-ST elevation myocardial infarction (NSTEMI).
  2. What does STEMI stand for? STEMI stands for ST-elevation myocardial infarction, a type of heart attack.
  3. How is the TIMI Risk Score calculated? The score is calculated based on age, number of CAD risk factors, Killip class, blood pressure, heart rate, and weight.
  4. What are the limitations of the TIMI Risk Score? The score may be biased towards older individuals and those with lower body weight. It also does not account for all possible risk factors.
  5. What are some alternatives to the TIMI Risk Score? One alternative is the GRACE risk score, which is more comprehensive but also more complex.
  6. What is the GRACE risk score? The GRACE risk score is a tool that predicts the risk of death in patients with acute coronary syndrome.
  7. How accurate is the TIMI Risk Score? The TIMI Risk Score is generally considered accurate, but individual results may vary.
  8. Can the TIMI Risk Score predict the need for revascularization? Yes, the TIMI Risk Score can predict the need for revascularization in patients with unstable angina or NSTEMI.
  9. What is the range of the TIMI Risk Score? The score ranges from 0 to 14, with higher scores indicating a higher risk of adverse events.
  10. How often should the TIMI Risk Score be calculated? The frequency of calculation depends on the patient’s condition and the doctor’s recommendation.


  1. American Heart Association
  2. National Institutes of Health