CAC Score Calculator
Coronary calcium scoring predicts heart disease risk. Calculate percentile rankings and risk categories from CAC scan results.
How the CAC Score Calculator works
Enter calcium scores for each artery, age, and gender. Calculate percentile ranking, risk category, 10-year event probability, and get guideline-based treatment recommendations.
CAC scores predict cardiac events better than traditional risk factors. This calculator interprets your score, providing clear risk assessment and action steps.
How it works
Tutorial
Coronary artery calcium (CAC) scoring provides powerful cardiac risk prediction beyond traditional cholesterol and blood pressure measurements. Understanding your CAC score percentile and what it means for treatment helps make informed decisions about preventive cardiac care.
You have two options: use the calculator above to interpret your CAC scan results instantly, or follow this guide to manually understand CAC score risk categories.
The Formula
| Component | Meaning |
|---|---|
| CAC Score | Total calcium in coronary arteries (Agatston units) |
| Percentile | Your score vs. others same age/gender |
| Risk Category | 0 = None, 1-99 = Mild, 100-399 = Moderate, 400+ = Severe |
Step-by-Step Calculation
Here’s how to interpret a CAC scan result.
Step 1: Identify Your CAC Score
Review the scan results from each artery:
| Artery | Calcium Score |
|---|---|
| Left Main | 25 |
| LAD (Left Anterior Descending) | 145 |
| Circumflex | 38 |
| Right Coronary | 42 |
| Total CAC Score | 250 |
Calculation: 25 + 145 + 38 + 42 = 250 Agatston units
Step 2: Determine Percentile Ranking
Compare to age/gender matched population:
| Your Profile | Value |
|---|---|
| Age | 55 years old |
| Gender | Male |
| Total CAC Score | 250 |
| Percentile Rank | 75th percentile |
Interpretation: Your score is higher than 75% of men your age
Step 3: Assess Risk Category
Determine clinical significance and recommendations:
| Risk Factor | Your Status |
|---|---|
| CAC Score | 250 (Moderate) |
| Risk Category | Moderate atherosclerosis |
| 10-Year Event Risk | 10-15% (elevated) |
| Recommendation | Statin therapy, lifestyle modification |
Final Answer: CAC score of 250 indicates moderate risk
What This Means
A CAC score of 250 places you at moderate risk for cardiac events. This typically warrants aggressive risk factor management including statin therapy, aspirin, blood pressure control, and lifestyle changes regardless of traditional risk calculators.
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