Free ASCVD risk tool
10-Year ASCVD Risk Calculator with Coronary Artery Calcium
Astro-CHARM estimates your 10-year risk of a heart attack or stroke by combining traditional risk factors with your coronary artery calcium score — for adults aged 40–65 with no prior cardiovascular disease.
Runs privately in your browser — nothing is sent or stored.
Why Astro-CHARM
Traditional risk factors, sharpened by your calcium score
Adding a coronary artery calcium (CAC) score to the usual risk factors gives a more individualized 10-year estimate of ASCVD events.
Coronary calcium precision
Adds your coronary artery calcium (CAC) score to traditional risk factors for a more individualized 10-year estimate.
Built on major cohorts
Developed from three large, population-based cohorts and validated in the Framingham Heart Study.
Private by design
The calculator runs entirely in your browser. Your inputs and results are never transmitted or stored.
Free to everyone
No account and no cost. Available on the web and as an iPhone app.
How it works
Three simple steps
- 01
Gather your numbers
You'll need your CAC score in Agatston units, systolic blood pressure, and total and HDL cholesterol. An hs-CRP value is optional.
- 02
Enter your details
Answer a short set of questions about your risk factors. It takes about a minute, right in your browser.
- 03
Review with your clinician
Use your estimate as one part of a shared decision-making conversation about cardiovascular disease prevention.
On the go
Astro-CHARM on iPhone
Prefer an app? Astro-CHARM is available free on the App Store.
FAQ
Frequently asked questions
- What is the Astro-CHARM calculator?
- Astro-CHARM is a free tool that estimates your 10-year risk of a heart attack or stroke (ASCVD) by combining traditional risk factors with your coronary artery calcium (CAC) score. It is intended for adults aged 40–65 with no prior history of cardiovascular disease.
- Do I need a coronary artery calcium (CAC) score to use it?
- Yes. A CAC score in Agatston units is required to get a result from Astro-CHARM. If you do not have a CAC score, a calculator that uses only demographics and traditional risk factors should be used instead.
- Who is Astro-CHARM intended for?
- It is intended for younger individuals, ages 40 to 65, without a prior history of ASCVD. It is best applied to people who are not already taking statins.
- Is my information kept private?
- Yes. The calculator runs entirely in your browser. Your inputs and results are never sent to a server, saved, or shared.
- Is the result a diagnosis?
- No. The result is an estimate meant to support a shared decision-making conversation with your healthcare provider about prevention. It is not medical advice.
- What is the difference between the two calculators, with and without CRP?
- Astro-CHARM is really two models — one that uses high-sensitivity C-reactive protein (CRP) and one that does not. CRP is optional; if you have an hs-CRP result in mg/L you can include it, otherwise the calculator uses the model without it.
Estimate your 10-year ASCVD risk
The calculator runs privately in your browser. Your inputs and results are never sent or stored.