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Use our free Duke Treadmill Score Calculator to calculate your DTS instantly with the official formula, step-by-step calculation, examples, and risk results.
| DTS Score | Risk Category | Annual CV Mortality | Clinical Action |
|---|---|---|---|
| ≥ +5 | Low Risk | < 1% | Medical management; no urgent further testing in most cases |
| −10 to +4 | Intermediate Risk | 1% – 3% | Further evaluation recommended (e.g., imaging stress test, coronary angiography) |
| < −10 | High Risk | > 3% | Prompt further assessment; consider early coronary angiography |
| AI Value | Condition | Clinical Meaning |
|---|---|---|
| 0 | No angina | No chest pain or equivalent symptoms during the entire test |
| 1 | Non-limiting angina | Angina occurred during exercise but did not cause premature termination |
| 2 | Limiting angina | Angina was the primary reason the test was stopped before target heart rate |
| Stage | Speed (mph) | Grade (%) | Stage Duration | Cumulative Time |
|---|---|---|---|---|
| Stage 1 | 1.7 mph | 10% | 3 min | 3 min |
| Stage 2 | 2.5 mph | 12% | 3 min | 6 min |
| Stage 3 | 3.4 mph | 14% | 3 min | 9 min |
| Stage 4 | 4.2 mph | 16% | 3 min | 12 min |
| Stage 5 | 5 mph | 18% | 3 min | 15 min |
| Stage 6 | 5.5 mph | 20% | 3 min | 18 min |
| Stage 7 | 6 mph | 22% | 3 min | 21 min |
A treadmill stress test can reveal a lot about how your heart performs during exercise. But once the test is over, many people find themselves staring at numbers and medical terms that are difficult to understand. That's where our Duke Treadmill Score Calculator comes in.
Instead of calculating everything by hand, you can enter a few values from your stress test report and get your Duke Treadmill Score (DTS) instantly. The calculator not only gives you the final score but also shows every step of the calculation, making it easy to see how the result was determined.
Whether you're a healthcare professional, a medical student, or simply someone trying to understand a treadmill stress test report, this tool helps simplify a calculation that has been trusted in cardiology for decades.
The Duke Treadmill Score, often shortened to DTS, is a clinical scoring system used after a treadmill exercise stress test to monitor Blood Pressure and other health indicators. It combines three important pieces of information into a single score:
Exercise duration, changes in the ECG's ST segment, and whether the patient experienced chest pain during exercise.
Rather than looking at each result separately, the Duke Treadmill Score brings everything together to estimate the likelihood of future heart-related problems.
In simple terms, the higher your score, the better your overall prognosis tends to be. Lower scores may suggest a greater risk of coronary artery disease and often lead to additional testing.
Because of its proven reliability, the Duke Treadmill Score continues to be one of the most widely used tools for interpreting standard Bruce protocol exercise stress tests.
The Duke Treadmill Score is calculated using a straightforward mathematical formula:
Duke Treadmill Score = Exercise Time − (5 × ST-Segment Deviation) − (4 × Angina Index)
Here's what each value means.
Exercise Time is the total amount of time the patient exercised during the standard Bruce protocol, measured in minutes.
ST-Segment Deviation is the largest ST depression or elevation recorded during the exercise ECG, measured in millimeters.
The Angina Index describes chest pain during the test.
AI = 0 means no angina occurred.
AI = 1 means angina developed but the patient was able to continue exercising.
AI = 2 means angina became severe enough that the exercise test had to be stopped.
Once these values are entered, the formula calculates the final Duke Treadmill Score automatically.
If you ever want to understand how the score is calculated behind the scenes, the process is surprisingly simple.
Start by recording the total exercise time from the treadmill stress test. If your report lists the duration in seconds, convert it into minutes first.
Next, find the maximum ST-segment deviation shown on the ECG report and note its value in millimeters.
Then determine the correct Angina Index based on what happened during the test.
Multiply the ST-segment deviation by five.
Multiply the Angina Index by four.
Finally, subtract both of those values from the exercise time.
The number you get is the Duke Treadmill Score.
Afterward, compare the result with the standard interpretation:
A score of 5 or above usually represents low cardiovascular risk.
A score between -10 and +4 falls into the intermediate-risk range.
A score below -10 indicates high risk and generally requires further medical evaluation.
Our calculator is designed to make the entire process quick and stress-free.
Begin by entering the total exercise duration from the treadmill stress test. You can enter the value in either minutes or seconds, and the calculator will handle the conversion automatically.
Next, type in the maximum ST-segment deviation measured during the exercise ECG.
After that, select the correct Angina Index based on the patient's symptoms.
Once everything is entered, simply click the Calculate button.
Within seconds, the calculator displays the Duke Treadmill Score, explains each calculation step, and identifies the appropriate cardiovascular risk category.
There's no need to work through the formula manually or worry about calculation mistakes.
Let's look at a simple example.
Imagine a patient exercised for 12 minutes during the Bruce protocol treadmill test.
The ECG showed a maximum ST-segment deviation of 1.2 mm.
The patient experienced chest pain but completed the test, giving an Angina Index of 1.
First, calculate the ST-segment deduction.
5 × 1.2 = 6
Next, calculate the angina deduction.
4 × 1 = 4
Now apply the formula.
Duke Treadmill Score = 12 − 6 − 4
Duke Treadmill Score = 2
Because the score falls between -10 and +4, the patient is classified as Intermediate Risk.
Seeing the calculation step by step makes it much easier to understand where the final score comes from.
One of the most common questions people ask is, "What is a normal Duke treadmill score?"
Generally, a score of 5 or higher is considered normal because it places the patient in the low-risk category.
People in this group usually have an excellent prognosis and a relatively low chance of future cardiovascular events.
Scores ranging from -10 to +4 represent an intermediate level of risk. Depending on the patient's symptoms and medical history, doctors may recommend additional imaging or other diagnostic tests.
A score below -10 is considered high risk and often indicates the need for further cardiac evaluation.
It's worth remembering that the Duke Treadmill Score is only one part of the overall clinical picture. Doctors also consider medical history, physical examination, laboratory findings, imaging studies, and other risk factors before making treatment decisions.
Manual calculations are easy to get wrong, especially when you're working with multiple numbers.
Our calculator removes that hassle by performing every calculation instantly and accurately.
It supports exercise time entered in either minutes or seconds, follows the validated Duke Treadmill Score formula, and clearly explains each step of the calculation.
The tool also identifies the appropriate risk category and presents the results in a way that's easy to understand, even if you're not familiar with cardiology.
Whether you're reviewing a stress test report, studying for medical exams, or checking your calculations, our Duke Treadmill Score Calculator makes the process simple and reliable.
The Duke Treadmill Score Calculator is a practical tool that turns complex stress test data into an easy-to-understand result. By combining exercise duration, ST-segment changes, and the Angina Index, it provides a well-established estimate of cardiovascular risk following a standard Bruce protocol treadmill test.
Our calculator performs every step automatically, explains the calculation clearly, and presents the result in seconds. While it's an excellent educational and clinical support tool, it should never replace professional medical judgment. The final interpretation should always come from a qualified healthcare provider who can evaluate the score alongside the patient's complete medical history and examination.
The Duke Treadmill Score Calculator is an online tool that calculates the Duke Treadmill Score using exercise time, ST-segment deviation, and the Angina Index. It also explains the calculation and identifies the appropriate cardiovascular risk category.
Use this formula:
Duke Treadmill Score = Exercise Time − (5 × ST-Segment Deviation) − (4 × Angina Index)
Simply enter the three required values, and the calculator does the rest automatically.
A score of 5 or higher is generally considered normal and is associated with a low risk of future cardiovascular events.
A negative score suggests a higher level of cardiovascular risk. The lower the score, the greater the likelihood that additional medical evaluation may be needed.
No. The Duke Treadmill Score has been validated specifically for the standard Bruce protocol. It should not be applied to other exercise testing protocols without appropriate clinical validation.
The Angina Index measures chest pain during the exercise test.
An index of 0 means no angina occurred.
An index of 1 means angina developed but the patient completed the test.
An index of 2 means angina caused the test to end early.
Exercise duration reflects functional exercise capacity. In general, patients who exercise longer tend to achieve higher Duke Treadmill Scores, which are associated with a more favorable prognosis.
No. The calculator estimates cardiovascular risk based on treadmill stress test results. It is not a diagnostic tool and should always be used alongside a comprehensive medical evaluation by a qualified healthcare professional.