Coronary Artery Calcium (CAC) Score Calculator
Enter your age, sex, and CAC score from your CT report to get a quick risk category and a rough age/sex percentile estimate.
Educational tool only. Not a diagnosis. Discuss all results with your clinician.
What is a CAC score?
A coronary artery calcium (CAC) score measures calcified plaque in the heart’s arteries using a non-contrast CT scan. The result is reported in Agatston units. In general, higher scores are associated with higher risk of future cardiovascular events.
CAC is often used when someone’s risk is uncertain and doctor/patient want a clearer picture before deciding on prevention strategies such as statin therapy, blood pressure targets, and lifestyle intensity.
How to use this CAC score calculator
- Use the exact CAC value shown on your imaging report.
- Add your age and sex to get an approximate peer percentile range.
- Use the category and interpretation as a conversation starter with your healthcare professional.
CAC score categories and common interpretation
| CAC Score | Typical Category | General Interpretation |
|---|---|---|
| 0 | No detectable calcium | Very low short-term event risk in many people (not zero risk). |
| 1–99 | Mild plaque burden | Early atherosclerosis present; prevention intensity often increases. |
| 100–299 | Moderate plaque burden | Meaningful burden; risk management is usually more aggressive. |
| 300–999 | High plaque burden | Higher event risk; comprehensive risk factor treatment is typically advised. |
| 1000+ | Very high plaque burden | Very high risk group; close clinical follow-up is important. |
How clinicians use CAC with the rest of your profile
CAC does not replace clinical judgment. It is one data point combined with:
- Blood pressure, LDL cholesterol, and diabetes status
- Smoking history and family history of early heart disease
- Inflammation/metabolic health, weight, sleep, and activity patterns
- Symptoms (if present) and overall preventive goals
Important nuance
A CAC score of zero is reassuring for many asymptomatic adults, but it does not rule out all plaque or all risk. In younger adults, soft (non-calcified) plaque may not appear on CAC scoring. Also, risk can still be elevated due to diabetes, active smoking, very high LDL, or strong family history.
What to do after you get your score
- If CAC = 0: reinforce healthy habits; medication decisions depend on your full risk context.
- If CAC 1–99: optimize lifestyle and discuss lipid management with your clinician.
- If CAC ≥ 100: many patients benefit from more intensive prevention plans.
- If CAC very high: strict risk-factor control and regular follow-up become especially important.
Limitations of any online CAC calculator
Percentiles and risk multipliers shown online are approximations. Different populations and studies produce different estimates. Your personal treatment plan should come from your own physician, who can interpret imaging, lab values, medications, and symptoms together.
Bottom line
CAC scoring can be a useful reality check: it converts invisible plaque burden into a visible number. That number can motivate focused action, but the most important outcome is what you do next—consistent lifestyle improvement and evidence-based prevention with your care team.