# DAPT Score Calculator

URL: https://speedycalculator.com/calculators/health/dapt/
Last updated: 2026-10-30

> The DAPT score calculator weighs the benefit (fewer heart attacks and stent thromboses) against the harm (more bleeding) of continuing dual antiplatelet therapy beyond 12 months after a coronary stent.

## Inputs

- Age
- Cigarette smoking
- Diabetes
- Heart attack at presentation
- Prior PCI or prior heart attack
- Paclitaxel-eluting stent
- Stent diameter under 3 mm
- Heart failure or LVEF under 30%
- Vein graft stent

## Results

- DAPT score
- Interpretation

## Formula

```
Score = sum of the points for each item
```

## Explanation

The DAPT score was derived from the DAPT trial of more than 11,000 patients. A score of 2 or more favours prolonged dual antiplatelet therapy; below 2, the bleeding risk outweighs the ischaemic benefit.

### How to use the DAPT Score Calculator

- **Age**
- **Cigarette smoking**
- **Diabetes**
- **Heart attack at presentation**
- **Prior PCI or prior heart attack**
- **Paclitaxel-eluting stent**
- **Stent diameter under 3 mm**
- **Heart failure or LVEF under 30%**
- **Vein graft stent**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Each answer carries the points shown in the published score. The calculator adds them up and maps the total to the published interpretation.

### Scoring table

ItemAnswers and pointsAgeUnder 65 = 0; 65–74 = -1; 75 or older = -2Cigarette smokingNo = 0; Yes = 1DiabetesNo = 0; Yes = 1Heart attack at presentationNo = 0; Yes = 1Prior PCI or prior heart attackNo = 0; Yes = 1Paclitaxel-eluting stentNo = 0; Yes = 1Stent diameter under 3 mmNo = 0; Yes = 1Heart failure or LVEF under 30%No = 0; Yes = 2Vein graft stentNo = 0; Yes = 2

### Inputs explained

FieldWhat to enterAgeChoose one: Under 65, 65–74, 75 or olderCigarette smokingChoose one: No, YesDiabetesChoose one: No, YesHeart attack at presentationChoose one: No, YesPrior PCI or prior heart attackChoose one: No, YesPaclitaxel-eluting stentChoose one: No, YesStent diameter under 3 mmChoose one: No, YesHeart failure or LVEF under 30%Choose one: No, YesVein graft stentChoose one: No, Yes
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — Age: Under 65; Cigarette smoking: No; Diabetes: No; Heart attack at presentation: Yes; Prior PCI or prior heart attack: No; Paclitaxel-eluting stent: No; Stent diameter under 3 mm: No; Heart failure or LVEF under 30%: No; Vein graft stent: No.

Results — **DAPT score = 1**; Interpretation = Score below 2 – bleeding risk likely outweighs benefit of prolonged DAPT.

## Key terms

- **PCI**: Percutaneous coronary intervention (stenting).
- **DAPT**: Dual antiplatelet therapy.

## FAQ

**What is DAPT?**
Dual antiplatelet therapy: aspirin plus a P2Y12 inhibitor such as clopidogrel or ticagrelor.

**When is the DAPT score used?**
After 12 months of uneventful DAPT following a stent.

**Can the score be negative?**
Yes – older age lowers the score because bleeding risk rises.


## Sources

- [Yeh RW et al. Development and validation of a prediction rule for benefit and harm of DAPT beyond 1 year after PCI. JAMA, 2016](https://pubmed.ncbi.nlm.nih.gov/27022822/)