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

Q: Can you reverse a calcium score?

Calcium scores typically do not decrease, even with statins and aggressive lifestyle changes. Statins may actually slightly increase the score because they stabilize soft plaque by calcifying it, which is actually protective. The goal of treatment is to prevent plaque rupture and heart attacks, not to lower the calcium number itself.

Q: Does a zero calcium score mean I have no heart disease risk?

A zero score is very reassuring but does not mean zero risk. It means there is no detectable calcified plaque, but non-calcified ("soft") plaque can still be present and is not detected by this scan. Traditional risk factors like smoking, diabetes, high blood pressure, high cholesterol, and family history still matter and should still be managed.

Updated March 2026 · 10 min read · By Travis Cook

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's 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 the raw number only tells half the story. What really matters is how your score stacks up against other people your 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

Context changes everything. A score of 150 in a 50-year-old white male is above the 90th percentile -- worse than 90% of peers. The same 150 in a 75-year-old is completely average. 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 matters too. White men have the highest calcium scores at every age. Black men and women run lower. But here's the catch: 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 doesn't mean zero risk. Non-calcified ("soft") plaque can still be present and isn't detected by a calcium scan. Risk factors like smoking, diabetes, family history, and high cholesterol still matter.

The "warranty period" of a zero score varies by sex and ethnicity, ranging from approximately 3.5 years for White men to 7.4 years for Chinese American women (Dzaye et al., JACC Cardiovasc Imaging 2021). For most men, rescanning in 3-5 years is appropriate. For women, the warranty is generally longer at 5-7 years. Diabetes shortens the warranty by about 35%. The 2018 ACC/AHA guidelines state it's reasonable to reassess in 5-10 years for low-risk individuals with a zero score.

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.

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How to Talk to Your Doctor About Your Results

If you've your calcium score and aren't sure what to do next, bring it to your next appointment and ask your doctor three questions: How does my score compare to others my age? Should I start or adjust any medications? When should I consider a follow-up scan? For borderline cases (scores of 1-99 in younger patients, or 100-300 in older patients), the decision about statin therapy is nuanced and benefits from a shared conversation about your overall risk, family history, and personal preferences.

Lifestyle Changes That Reduce Heart Disease Risk

Regardless of your calcium score, the following lifestyle changes are supported by strong evidence: regular aerobic exercise (at least 150 minutes per week of moderate activity), maintaining a healthy weight, eating a Mediterranean-style diet rich in vegetables, whole grains, fish, and olive oil, not smoking, limiting alcohol consumption, managing blood pressure below 130/80, keeping LDL cholesterol under control, and managing stress. While these changes may not lower your calcium score number, they significantly reduce your risk of a heart attack by stabilizing plaque and improving overall cardiovascular health.

About the Author

Travis Cook writes about health and wellness for MayoCalc. With a background in radiology and clinical imaging, Travis translates peer-reviewed medical research into practical guidance backed by data from the ADA, AHA, ACC, and CDC. All health content is sourced and linked so you can verify every claim.

Calcium Score FAQ

What is a good calcium score?

A score of 0 is excellent and means no detectable calcified plaque in your coronary arteries. It's the strongest negative predictor of heart disease available. Scores of 1-99 indicate mild plaque. Scores of 100-399 are moderate and associated with greater than 7.5% ten-year cardiovascular risk. Scores above 400 are considered severe.

Is a calcium score of 100 bad?

A score of 100 indicates moderate calcified plaque and places you in a higher risk category. In the MESA study, all participants with CAC of 100 or above had ten-year event rates consistently above 7.5% regardless of age, sex, or ethnicity. ACC/AHA guidelines recommend statin therapy at this level. However, context matters: a score of 100 is more concerning for a 50-year-old (above the 90th percentile) than for a 75-year-old (below average).

Can you reverse a calcium score?

Calcium scores typically don't decrease, even with statins and aggressive lifestyle changes. Statins may actually slightly increase the score because they stabilize soft plaque by calcifying it, which is actually protective. The goal of treatment is to prevent plaque rupture and heart attacks, not to lower the calcium number itself.

How much does a coronary calcium scan cost?

In the U.S., a calcium scan typically costs $49-200 out of pocket. Most insurance doesn't cover it because it's a screening test. The scan takes about 10 minutes, involves no injections or contrast dye, and exposes you to very low radiation (about 1 millisievert).

Who should get a calcium score scan?

ACC/AHA guidelines recommend considering a calcium 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. It's most useful for "tie-breaking" borderline statin decisions. It's generally not recommended for very low-risk or very high-risk individuals, since the result wouldn't change their treatment plan.

Does a zero calcium score mean I have no heart disease risk?

A zero score is very reassuring but doesn't mean zero risk. It means there's no detectable calcified plaque, but non-calcified ("soft") plaque can still be present and isn't detected by this scan. Traditional risk factors like smoking, diabetes, high blood pressure, high cholesterol, and family history still matter and should still be managed.

What is the warranty period of a zero calcium score?

Research suggests that a zero score remains prognostically reassuring for approximately 3-5 years, sometimes called the "warranty period." After that, rescanning may be appropriate, especially for individuals with ongoing risk factors. Some cardiologists extend this to 5-10 years for very low-risk patients.

For more on this topic, see our calcium score percentile chart.

For more on this topic, see our MESA risk score guide.

Sources

McClelland RL et al., Circulation 2006: MESA CAC distribution data by race, gender, and age
Blumenthal RS et al., Circulation 2026: 2026 ACC/AHA Guideline on the Management of Dyslipidemia
MESA CAC Reference Values Tool: Official MESA calcium score percentile calculator

Medical Disclaimer: This article is for educational purposes only and does not constitute medical advice. Reference data from the Multi-Ethnic Study of Atherosclerosis (MESA): McClelland RL, et al. Circulation. 2006;113(1):30-37. Always consult your healthcare provider for medical decisions.