Duke Treadmill Score Calculator
Calculate your Duke Treadmill Score instantly using Bruce Protocol stress test data. Enter exercise duration, ST segment deviation, and angina index to assess cardiovascular risk with this cardiac treadmill test calculator.
Stress test inputs
Adjust the controls — your Duke score updates instantly.
No angina / no chest pain during test.
What Is the Duke Treadmill Score?
The Duke Treadmill Score (DTS) is a validated clinical index used to stratify cardiovascular risk after an exercise stress test. Our duke treadmill score calculator applies the original Mark nomogram formula so patients and clinicians can quickly interpret Bruce Protocol results without manual computation.
This treadmill stress test score calculator combines three objective stress-test variables — exercise capacity, ECG changes, and angina symptoms — into a single prognostic score linked to 5-year survival outcomes.
Duke Treadmill Score Calculation
DTS = Exercise Time (min) − (5 × ST Deviation mm) − (4 × Angina Index)Angina index values used in this duke treadmill score calculation:
- 0 — No angina / no chest pain during the test
- 1 — Non-limiting angina (pain occurred but did not stop the test)
- 2 — Test-limiting angina (severe pain forced test termination)
Risk Classification Framework
Standard clinical categories applied by this duke nomogram treadmill calculator:
| Risk Category | Duke Score | 5-Year Survival | Interpretation |
|---|---|---|---|
| Low Risk | ≥ +5 | 97% – 99% | Favorable prognosis; low annual mortality |
| Moderate Risk | −10 to +4 | 90% – 95% | Intermediate risk; further evaluation may be warranted |
| High Risk | ≤ −11 | 65% – 79% | Unfavorable prognosis; aggressive management indicated |
Example Calculation
A patient completing 10 minutes of Bruce Protocol exercise with 1.0 mm ST depression and no angina (index 0):
DTS = 10 − (5 × 1.0) − (4 × 0) = +5 → Low RiskFrequently Asked Questions
Is this cardiac treadmill test calculator a medical diagnosis?
No. This duke treadmill score calculator provides educational risk stratification only. All stress test results should be interpreted by a qualified cardiologist in the context of your full clinical picture.
What ST deviation value should I enter?
Enter the maximum ST-segment depression (or elevation) measured on your ECG during the stress test, in millimeters. Values are typically reported by the supervising physician or automated ECG analysis system.
Does the Duke score work with protocols other than Bruce?
The Duke Treadmill Score was validated specifically with the Bruce Protocol. Using exercise time from other protocols may reduce accuracy. Always confirm protocol compatibility with your healthcare provider.
How does angina index affect my score?
Each angina index point subtracts 4 from your Duke score. Test-limiting angina (index 2) reduces your score by 8 points compared to an asymptomatic test — significantly shifting risk category.
Medical Disclaimer: This cardiac treadmill test calculator is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider regarding stress test results.