Arterial Age Calculator (Coronary Calcium Score)
Enter your coronary artery calcium (CAC) score from a cardiac CT scan and your actual age. The calculator uses the MESA-validated formula to estimate your arterial age, the age at which average arteries carry the same calcium burden as yours. Your result updates instantly, and you get a plain-English interpretation, a steps panel showing the math, and a reference table of standard calcium score categories.
Formula
Worked example
A 55-year-old with a CAC score of 150: log10(150 + 1) = log10(151) = 2.179. Arterial age = 39.1 + 7.25 x 2.179 = 39.1 + 15.8 = 54.9 years. The arterial age (55) is almost identical to the chronological age (55), indicating calcium accumulation consistent with the average for this age.
What is arterial age?
Arterial age (also called vascular age) is the age at which average, healthy arteries carry the same amount of calcified plaque as yours. It translates the Agatston coronary artery calcium (CAC) score, an abstract number from a cardiac CT scan, into a scale that is easier to understand and act on. If your arterial age is ten years above your real age, your arteries are accumulating calcium at the pace typical of someone a decade older. If it is below your real age, your coronary arteries appear in better shape than average for your age group. The concept was introduced through the MESA (Multi-Ethnic Study of Atherosclerosis), a landmark NIH-funded study that tracked cardiovascular disease in more than 6,800 men and women over many years.
What is the coronary artery calcium (CAC) score?
The CAC score, also called the Agatston score after cardiologist Arthur Agatston who devised it in the 1980s, is a measure of calcium deposits inside the coronary arteries obtained from a low-dose, non-contrast cardiac CT scan. Calcium builds up inside arterial walls as part of atherosclerosis, the process by which plaques of fat, cholesterol, and inflammatory cells harden and narrow the arteries that feed the heart. A score of 0 means no calcium was detected, which is associated with a very low 5-10 year risk of heart attack. Scores above 100 are linked to a meaningfully higher risk, and scores above 400 indicate a heavy burden that most guidelines associate with elevated event risk warranting aggressive management. The scan takes about 10 minutes, uses a low radiation dose, and does not require contrast dye or special preparation.
How to interpret your arterial age result
Compare your arterial age to your real age. A difference within about five years in either direction is broadly consistent with average calcium accumulation for your age group. An arterial age more than five years above your real age suggests faster-than-average plaque buildup and is a reason to review cardiovascular risk factors with your doctor: blood pressure, LDL cholesterol, blood glucose, smoking, weight, and physical activity level. An arterial age more than five years below your real age suggests slower-than-average calcification, which is generally reassuring, though it does not rule out soft (non-calcified) plaques that the CAC scan cannot detect. Sex matters: women typically develop coronary calcium 10-15 years later than men, so a calcium score that might be average in a 65-year-old man is notable in a 55-year-old woman.
Limitations of arterial age and the CAC score
The MESA formula was derived from a predominantly middle-aged North American population and may not translate exactly across all ethnicities or age ranges. Arterial age captures only calcified plaque; it misses soft, non-calcified plaques that can also rupture and cause heart attacks. The formula does not factor in sex, ethnicity, blood pressure, cholesterol, or smoking directly, so the same score can imply different absolute risks in different people. The calculator is a screening and educational tool, not a substitute for a formal cardiovascular risk assessment by a clinician. Decisions about medication, further testing, or lifestyle change should be made with a doctor who has access to your full medical history.
Agatston Score Categories and Cardiovascular Risk
| Agatston Score | Category | Implication |
|---|---|---|
| 0 | No calcification | Very low short-term coronary risk |
| 1-10 | Minimal | Low risk; monitor with lifestyle measures |
| 11-100 | Mild | Mild increase in risk; lifestyle intervention indicated |
| 101-400 | Moderate | Moderately elevated risk; statin therapy discussion |
| >400 | Severe | High risk; medical management strongly advised |
Standard thresholds used by the American College of Cardiology and American Heart Association (ACC/AHA) for interpreting coronary artery calcium scores.
Frequently asked questions
What is a normal arterial age?
There is no single "normal" number; arterial age is most meaningful in relation to your real age. An arterial age within roughly five years of your chronological age is consistent with average calcium accumulation. An arterial age significantly above your real age suggests faster-than-average plaque buildup. A score of 0 corresponds to an arterial age of about 39 years using the MESA formula, reflecting that a zero-calcium result is expected in younger adults.
Can I lower my arterial age?
Once calcium is deposited in an artery wall it does not dissolve, so the CAC score and the arterial age derived from it can only stay the same or increase over time. However, the rate of progression can be slowed significantly. Statins reduce plaque progression and event risk even without reversing calcification. Blood pressure control, smoking cessation, regular aerobic exercise, a Mediterranean-style diet, weight management, and blood sugar control are all evidence-based ways to reduce the pace of further plaque buildup and lower the absolute risk of a cardiac event.
How is the CAC score measured?
A cardiac CT scan (sometimes called a heart scan or EBCT scan) takes multiple X-ray images of the chest over one heartbeat. Software identifies areas of dense calcium in the coronary arteries and calculates a weighted score based on the density and area of each lesion. The test takes about 10 minutes, uses a low radiation dose (roughly equivalent to a mammogram), requires no contrast injection, and is usually not covered by insurance when ordered purely for screening, though this varies.
Who should consider getting a CAC scan?
Current ACC/AHA guidelines suggest that CAC scoring is most useful for adults aged 40-75 who are at intermediate cardiovascular risk (10-year ASCVD risk of 7.5-20%) and for whom the decision to start statin therapy is uncertain. It can also help resolve uncertainty in patients who are reluctant to take medication or whose clinical risk assessment is ambiguous. CAC scanning is generally not recommended for low-risk adults (it is unlikely to change management) or high-risk adults (treatment is already indicated).
Is the arterial age formula the same as the "heart age" used in other tools?
No. Heart age (or cardiovascular age) tools like those from the CDC or BHF estimate a risk-equivalent age from risk factors such as blood pressure, cholesterol, smoking, and diabetes, without needing a scan. The MESA arterial age formula translates only the CAC score. The two approaches complement each other: risk-factor-based heart age is useful before a scan; CAC-based arterial age is more specific once the scan result is available.
My CAC score is 0. Does that mean I have no heart disease risk?
A score of 0 is very reassuring and is associated with low short-term risk of a heart attack. Large studies show that people with a score of 0 have a very low 5-10 year event rate. However, zero does not mean zero risk: it does not exclude non-calcified (soft) plaques, which can also rupture, and it says nothing about other vascular beds. People with a zero score can still develop diabetes, hypertension, or other risk factors that raise long-term risk, so lifestyle attention and periodic review remain important.
Sources
- Kondos GT, et al. Electron-beam tomography coronary artery calcium and cardiac events: a 37-month follow-up of 5,635 initially asymptomatic low- to intermediate-risk adults. Circulation. 2003.
- Blaha MJ, et al. Associations between C-reactive protein, coronary artery calcium, and cardiovascular events: implications for the JUPITER population from MESA (Multi-Ethnic Study of Atherosclerosis). Circulation. 2011.
- Grundy SM, et al. 2018 AHA/ACC Guideline on the Management of Blood Cholesterol. Journal of the American College of Cardiology. 2019.