Calcium Score Ranges: What Your Results and Report Actually Mean

You finally got your calcium score report back, and now you're staring at a number, maybe a few numbers, with no idea what any of it means.

If you’ve never had a CAC test before, you’re probably wondering what your calcium score should be. What is a good calcium score? What makes your score “normal,” and when should you start worrying?

A calcium score comes from a quick, non-invasive CT scan of your heart arteries, and it's meant to help you and your doctor understand your risk before symptoms show up, not to hand you a scary number with no context. That's the goal of this guide too: context, not alarm.

Your score tells you how much calcified plaque was found in your arteries. Zero is the best possible score, while 400+ denotes a high risk.

However, what makes your score “good” or “bad” depends on your age range. Keep that in mind as you read through the ranges below, since the same number can mean genuinely different things depending on where you are in life and what your doctor already knows about your health.

Below, you'll find what each range means, how to read the vessel-by-vessel breakdown many reports include, and what actually counts as a good, normal, or bad score.

Key Takeaways

Your total score is called your Agatston score, the sum of calcium found across your four major heart arteries.
Scores fall into five ranges, from zero (no detectable plaque) to above 400 (extensive plaque).
"Good," "normal," and "bad" aren't official terms, but broadly, zero is reassuring, 1 to 99 is borderline, and 100 or higher is generally treated as significant.
Your report likely breaks the score down by vessel, and calcium in your left main artery carries more weight than the same amount elsewhere.
The total number isn't the whole story. Where the calcium sits matters too, as does your calcium score in relation to your age.
Your score and your percentile answer different questions. Reading your result well means knowing both.

What Is the Agatston Score?

Every calcium score test comes back as a single number, called your Agatston score, named for the cardiologist who first described how to calculate it in 1990.

An Agatston score falls into one of five ranges, from zero up to above 400. The higher the number, the more calcified plaque was found in your heart arteries. A high amount of plaque means you have an increased risk of heart disease.

Your calcium score is calculated based on the results of a coronary artery calcium (CAC) test. During the test, a scanner finds each calcified spot in your coronary arteries, scores it based on how dense and how large it is, then adds every spot together to get your total.

A score of zero means no calcified plaque was found. A score in the thousands is possible in someone with extensive disease.

The calculation itself weighs both how dense the calcium is and how much area it covers, so two people with plaque in the same location can still end up with different scores depending on how small or big that calcium deposit is.

Calcium Score Ranges, Band by Band

Doctors generally sort Agatston scores into five ranges:

Score	Category	What It Generally Means
0	None	No calcified plaque detected
1 to 10	Minimal	A very small amount of plaque
11 to 100	Mild	Plaque is present, at an early stage
101 to 400	Moderate	A meaningful amount of plaque
401 to 999	Extensive	A large amount of plaque
1,000 or higher	Very Extensive	A very large amount of plaque, its own closely studied high-risk category

A higher calcium score indicates a larger extent of plaque build-up in your arteries, though it’s not always the case. The calcium score test captures the calcified portion of the plaque, not the soft plaque, which is newer and often riskier.

A calcium score cannot show soft plaque. A coronary CT angiogram (CCTA) can show both calcified and noncalcified plaque, as well as whether plaque is narrowing an artery.

Plaque build-up leads to narrowing of the arteries. As it becomes larger, it can reduce blood flow – and oxygen flow – to the arteries and can manifest in the form of chest pain. The plaque, especially the soft plaque, can rupture too, leading to blockage of arteries and a heart attack.

A large study following more than 66,000 adults without known heart disease found that people with scores of 400 or higher had roughly four to five times the risk of death from heart disease over the 12 follow-up years, compared to people with a score of zero.

Reading Your Full CAC Report: Vessel-by-Vessel Results

Your total Agatston score is actually a sum of four numbers, one for each major coronary artery. Each coronary artery supplies blood to a different part of your heart muscle:

The left main (LM) artery, which splits into two major branches and feeds the largest share of the heart
The left anterior descending (LAD) artery, which supplies blood to the front wall
The left circumflex (LCX) artery, which wraps around the side and back of the heart
The right coronary artery (RCA), which supplies the bottom of the heart, including part of the electrical system that keeps your heartbeat regular

Most reports list each of these separately, then add them up to the total you see at the top.

Where your calcium sits matters, not just how much of it there is. Calcium in the left main artery, even in a relatively small amount, has been linked to meaningfully higher mortality risk than the same amount elsewhere, since the left main feeds a larger share of heart muscle than any other single vessel.

One large study found that people with any calcium in their left main artery had a 20 to 30 percent higher risk of death compared to people with the same total score concentrated in other arteries.

If your report flags left main calcium specifically, that's worth a direct conversation with your doctor, even if your total score looks moderate.

So, Is Your Calcium Score Good, Normal, or Bad?

Your report itself won't use the words good, normal, or bad. But here's how they roughly map onto the ranges above.

What Counts as a Normal Calcium Score?

There isn't one universal normal score, since what's typical rises substantially with age.

That’s why it’s worth looking at your percentile, not just your total Agatston score. Your calcium score tells you how much calcified plaque was found, full stop. Your percentile tells you how that amount compares to other people your age and sex, since a score that's unremarkable at 75 would stand out at 45.

In other words, two people could both have a score of 60, but if one is 45 and the other is 75, they're not in the same position at all. The 45-year-old is likely well above average for their age, while the 75-year-old is probably close to typical.

What Counts as a Good Calcium Score?

A calcium score of zero is the best possible result. It means no calcified plaque was found, and it's associated with a very low risk of a heart attack in the near term.

A score of zero doesn't guarantee you'll never develop heart disease, especially if you're younger, but it's a genuinely reassuring result. It's also worth knowing that a calcium score of zero doesn't rule out every risk factor.

Genetic markers like Lp(a), now part of standard screening under current guidelines, aren't reflected in your calcium score at all, so a great score doesn't mean every box has been checked.

What Counts as a Bad or High Calcium Score?

Scores of 100 and above are generally where doctors start treating the result as significant, regardless of age. This is often the point where a conversation about statins, and sometimes additional testing, starts to make sense.

Calcium scores of 401 to 999 are considered very high, while scores 1,000 and above are considered significantly high.

What’s the Highest Possible Calcium Score?

There’s no upper limit on a calcium score test. The highest range is 1,000 and higher. A score of 1,000 or higher gets treated as its own category, since it's been studied specifically as a distinct high-risk group.

Even at this level, though, research following people with scores this high for over a decade found their annual risk of dying from cardiovascular disease was still under 1 percent per year — in other words, it’s worth taking seriously and treating, but far from an automatic outcome.

What to Do Next

If your score is zero or low, that's reassuring, but it doesn’t mean you have zero chance of having a heart attack. Your score will likely increase over time, and certain factors — like high cholesterol, high blood pressure, or smoking — can contribute to plaque build-up.

For now, you can do the following:

Ask your doctor when you’ll need another CAC test
Consider other scans, like a CCTA scan, which gives you a clearer picture of your arteries.
Consider blood tests, like a cholesterol test
Maintain a healthy lifestyle, complete with a balanced diet, frequent exercise, and stress management

It’s worth keeping your eye on those factors, even when your calcium score is great.

If your score is high, this usually opens a conversation with your doctor about medications like statins, lifestyle changes, and sometimes further testing, depending on how high the number is and where the calcium sits.

Either way, the number itself isn't a treatment plan. It's a starting point for a conversation with your doctor, not a replacement for one. Your treatment won’t just depend on your calcium score range, but the full report. The vessel breakdown and any notes about plaque distribution can shape what your doctor recommends just as much as the actual number does.

What Your Score Doesn't Capture

Your Agatston score, and everything in this guide, describes calcified plaque only. It has no way of seeing soft plaque, the kind that hasn't hardened yet and is often the kind more likely to rupture and cause a heart attack. A moderate or even low score doesn't rule out soft plaque being present.

This is why a calcium score isn't a substitute for imaging that can see both kinds of plaque, like a CCTA scan.

The Bottom Line on Interpreting Your Calcium Score

Your calcium score report boils down to one number, the Agatston score, sorted into one of six ranges from zero to 1,000 and beyond.

Broadly, zero is reassuring, scores under 100 are borderline, and 100 or higher is generally treated as significant enough to act on.

Where the calcium sits matters too, especially in the left main artery. What the score can't do is see soft plaque, which is why a result, high or low, is best read together with your doctor rather than alone.

If you take one thing away from this guide, let it be this: your calcium score on its own is a starting point, not a verdict. How it maps to your age, where it's concentrated, and what it can't see all shape what it actually means for you.

See What a Calcium Score Can’t

Your calcium score report tells you about calcified plaque only. Our CCTA scan shows both hard and soft plaque, so you get a clearer picture of your risk.

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