What Is a Good Calcium Score? Complete Guide by Age and Gender

Updated March 2026 · 10 min read

If you've had a coronary artery calcium (CAC) scan, you're probably staring at a number and wondering what it means. Is 150 bad? Is 0 really that good? Does your age or ethnicity matter? This guide explains everything using data from the Multi-Ethnic Study of Atherosclerosis (MESA), the gold standard reference for calcium scoring.

The Quick Answer

A score of 0 is excellent and means no detectable calcified plaque. It is the single best negative risk predictor for heart disease. A score of 1-99 is mild. A score of 100-399 is moderate and consistently associated with greater than 7.5% ten-year risk across all demographics in MESA. A score of 400+ is severe and warrants immediate medical attention.

But those are just the absolute categories. What really matters is how your score compares to others of your same age, sex, and ethnicity.

Check Your Score Against MESA Data

Our calculator uses exact percentile data from the MESA reference tool for all ethnic groups.

Interpret Your Score

Calcium Score Categories and What They Mean

Score	Category	10-Year ASCVD Risk (MESA)	Clinical Implication
0	No Calcification	1.3-5.6%	Very low risk. May defer statin 5+ years.
1-99	Mild	Intermediate	Atherosclerosis present. Consider statin if borderline risk.
100-399	Moderate	>7.5% in all subgroups	Statin recommended per ACC/AHA. Aspirin may benefit.
400+	Severe	13-26%	Further evaluation recommended. Aggressive management.

Why Age and Ethnicity Matter

A calcium score of 150 means very different things for a 50-year-old versus a 75-year-old. For a 50-year-old white male, 150 would be above the 90th percentile, meaning their calcium burden is higher than 90% of similar peers. For a 75-year-old white male, 150 is below the 50th percentile, which is actually quite normal.

Ethnicity also matters significantly. White men consistently have the highest calcium scores at every age. Black men and women tend to have lower scores. However, MESA research found that CAC predicts cardiovascular events with the same strength across all ethnic groups. The absolute score thresholds (0, 100, 400) work regardless of demographics.

MESA Reference Data: What's Normal for Your Group?

Here are the 50th and 90th percentile calcium scores by age for white males and females, the most commonly scanned groups. These numbers come directly from the MESA CAC Reference Values tool:

White Males

Age	50th Percentile	90th Percentile	% With Any Calcium
45	0	36	25%
55	6	234	56%
65	71	802	77%
75	248	2,030	90%

White Females

Age	50th Percentile	90th Percentile	% With Any Calcium
45	0	0	7%
55	0	38	26%
65	0	228	47%
75	49	649	73%

What a Score of Zero Really Means

A calcium score of zero is remarkably reassuring. In MESA, participants with CAC = 0 had ten-year ASCVD event rates almost exclusively below 5%, regardless of age, sex, or ethnicity. The diagnostic likelihood ratio is 0.41 for coronary heart disease, making it the strongest negative risk predictor available. ACC/AHA guidelines support using a zero score to de-risk patients and potentially defer statin therapy.

However, a zero score does not mean zero risk. Non-calcified ("soft") plaque can still be present and is not detected by a calcium scan. Risk factors like smoking, diabetes, family history, and high cholesterol still matter.

The "warranty period" of a zero score is approximately 3-5 years, after which rescanning may be appropriate, especially for higher-risk individuals.

When to Get a Calcium Score Scan

ACC/AHA guidelines recommend considering a CAC scan for adults aged 40-75 who are at intermediate cardiovascular risk (10-year ASCVD risk of 7.5-20%) when the decision about statin therapy is uncertain. The scan is particularly useful for patients who are on the fence about starting a statin, as a zero score may allow them to safely defer medication.

The scan takes about 10 minutes, involves no injections or contrast dye, exposes you to minimal radiation (about 1 millisievert, less than annual background radiation), and typically costs $49-200 out of pocket (usually not covered by insurance).

Interpret Your Calcium Score Now

Enter your score, age, sex, and ethnicity to see your exact MESA percentile and risk assessment.

Use the Calculator