Calculator Inputs
Enter exercise test details. The result appears above this form after submission.
Example Data Table
| Case | Exercise Time | ST Deviation | Angina Index | DTS | Risk Class |
|---|---|---|---|---|---|
| Example A | 12:00 | 0.5 mm | 0 | 9.50 | Low risk |
| Example B | 08:00 | 1.5 mm | 1 | -3.50 | Intermediate risk |
| Example C | 05:00 | 2.0 mm | 2 | -13.00 | High risk |
| Example D | 09:30 | 1.0 mm | 0 | 4.50 | Intermediate risk |
Formula Used
Duke Treadmill Score = Exercise time in minutes - (5 × maximum ST deviation in mm) - (4 × angina index)
- Exercise time uses the total treadmill duration in minutes.
- Maximum ST deviation is the largest measured ST shift in millimeters.
- Angina index is 0 for none, 1 for non-limiting angina, and 2 for exercise-limiting angina.
This page also calculates supporting values like achieved percentage of age-predicted maximum heart rate and rate-pressure product for quick review.
How to Use This Calculator
- Enter age and optional patient label.
- Add treadmill duration using minutes and seconds.
- Enter the maximum ST deviation observed during testing.
- Select the angina index that best matches the exercise test.
- Optionally enter peak heart rate and peak systolic blood pressure.
- Click Calculate Score to view the result summary above the form.
- Use the CSV or PDF buttons to export the current calculation.
Frequently Asked Questions
1. What does the Duke Treadmill Score estimate?
It combines exercise duration, ST deviation, and angina during treadmill testing to summarize prognostic risk. It supports structured interpretation rather than replacing a full cardiology assessment.
2. What do the angina index values mean?
Use 0 when no angina occurs, 1 when angina occurs but does not stop exercise, and 2 when angina limits or ends the test.
3. Why is a higher score usually better?
Longer exercise time increases the score, while ST deviation and angina lower it. That pattern generally reflects better exercise performance with fewer ischemic features.
4. Does this calculator diagnose coronary artery disease?
No. It is an educational scoring tool. Diagnosis and treatment decisions require clinician review, symptoms, ECG details, imaging, medications, and the full patient context.
5. Can I use seconds in the exercise duration?
Yes. The calculator converts minutes and seconds into a decimal minute value before applying the formula, which improves precision for borderline cases.
6. Why include peak heart rate and blood pressure?
They do not change the score directly, but they help provide supporting context such as achieved percent of predicted maximum heart rate and rate-pressure product.
7. What export options are included?
The page can export the current calculation as a CSV summary or a simple PDF report, making it easier to document and share a result snapshot.
8. What if the result seems inconsistent with the clinical picture?
Trust the broader clinical assessment. A single score should never outweigh symptoms, physician judgment, ECG nuance, or other diagnostic findings.