Cardiology Calculators
All Cardiology calculators
- CRUSADE Bleeding Score CalculatorIn-Hospital Major Bleeding Risk in NSTEMI.
- DAPT Score CalculatorDAPT Duration After PCI.
- Diamond-Forrester CalculatorPretest Probability of CAD.
- H2FPEF Score CalculatorHFpEF Diagnosis Aid.
- PRECISE-DAPT Bleeding Risk Score CalculatorCalculate PRECISE-DAPT Bleeding Risk Score.
- SCORE2 10-Year Cardiovascular Risk CalculatorCalculate SCORE2 10-Year Cardiovascular Risk.
Few specialities lean on structured scores as heavily as cardiology, because the key decisions are all about trade-offs: prevent or wait, test or reassure, bleed or clot. This library collects the scores cardiologists actually reach for, from ten-year prevention risk to post-stent antiplatelet duration, with honest notes on what each score can and cannot do.
In short: Free cardiology calculators: SCORE2 10-year risk, DAPT and bleeding scores, Diamond-Forrester CAD probability and the H2FPEF heart failure aid. Browse the calculators below, each with an interpretation guide.
What cardiology covers, and the clinical questions these tools answer
Cardiology spans prevention, diagnosis and the management of established heart disease, and each of those jobs has a score. In prevention, the question is whose ten-year risk of a cardiovascular event justifies lifelong statin therapy and how intensive that therapy should be; the SCORE2 calculator answers it for people without established disease. In the chest pain clinic, the question is how likely coronary artery disease is before any test is ordered, because the value of testing depends entirely on the pre-test probability; the Diamond-Forrester calculator gives that estimate from age, sex and the character of the pain.
In heart failure, the diagnosis of preserved ejection fraction disease is notoriously slippery, because the ejection fraction looks normal and the symptoms overlap with deconditioning, lung disease and obesity. The H2FPEF score combines clinical features and echocardiographic markers into a probability that helps decide who needs invasive or advanced testing. After an acute coronary syndrome or a stent, the questions turn to trade-offs: the CRUSADE and PRECISE-DAPT scores estimate bleeding risk, and the DAPT score weighs ischaemic benefit against bleeding harm to guide how long dual antiplatelet therapy should continue.
When clinicians and students use these calculators
Primary care is where SCORE2 earns its keep: the prevention review for a patient in their fifties with borderline cholesterol, where the score moves the conversation from vague worry to a concrete ten-year number and a treatment threshold. Chest pain clinics use Diamond-Forrester at the referral stage, so that low-probability patients are reassured without unnecessary testing and high-probability patients go straight to definitive investigation.
On the cardiology ward and in the catheter laboratory, the bleeding and DAPT scores shape discharge planning. A patient with a high PRECISE-DAPT score after stenting may be planned for a short course of dual therapy with early de-escalation, while a high DAPT score after an uneventful first year supports continuing beyond twelve months. The H2FPEF score finds its home in the heart failure clinic and the echocardiography report, where breathlessness with a normal ejection fraction needs a structured answer rather than a shrug.
How to interpret results, and what they change in practice
SCORE2 produces a ten-year risk of fatal and non-fatal cardiovascular events as a percentage, and guidelines band that percentage into low, moderate, high and very high risk, each with different treatment intensity. The number should be read alongside age, because a modest percentage at forty can still warrant action, and alongside the risk factors the score does not include, such as family history and chronic inflammatory disease.
The DAPT score runs from minus 2 to plus 10, and a score of 2 or more suggests that prolonging dual antiplatelet therapy beyond a year reduces ischaemic events enough to outweigh the bleeding cost, while a lower score favours stopping at twelve months. PRECISE-DAPT works the other way round: a score of 25 or more marks high bleeding risk and supports a short course. Diamond-Forrester gives a pre-test probability that maps to action: very low probability needs no cardiac testing, intermediate probability justifies non-invasive testing, and high probability may warrant going straight to angiography. The H2FPEF score sorts patients into low, intermediate and high probability of heart failure with preserved ejection fraction, with intermediate scores prompting exercise testing or invasive haemodynamics.
Limitations and pitfalls
Every score is a product of its derivation population. SCORE2 is calibrated for European populations, with different versions for low, moderate, high and very high risk regions, and it should not be applied where it was never validated. The DAPT score comes from patients who had already completed twelve months of dual therapy without a bleed or ischaemic event after a drug-eluting stent, so it does not answer the question for patients outside that group. CRUSADE was derived in non-ST-elevation myocardial infarction and should not be stretched to other settings.
Diamond-Forrester in its original form overestimates disease probability in modern populations, which is why updated versions exist; treat any pre-test estimate as approximate and adjust for the local prevalence you actually see. The H2FPEF score is a diagnostic aid, not a diagnosis: it does not replace echocardiography, natriuretic peptides or clinical judgement. And no bleeding score should ever be used to deny a patient needed antithrombotic therapy without considering the ischaemic risk on the other side of the scales.
How to use this library
Start from the clinical question, not the calculator. If the question is prevention, go to SCORE2; if it is chest pain, Diamond-Forrester; if it is breathlessness with a preserved ejection fraction, H2FPEF; if it is post-stent planning, the bleeding and DAPT scores together. Read the interpretation bands on each page, check the population the score was built for, and document the score and the decision it informed. Scores support shared decision making; they never replace the conversation.
Related specialities
Frequently asked questions
What is the SCORE2 score?
SCORE2 estimates the ten-year risk of a first fatal or non-fatal cardiovascular event in people without established cardiovascular disease, using age, sex, smoking, blood pressure and lipids. It comes in versions calibrated for low, moderate, high and very high risk European regions, and the result guides how intensively to treat risk factors.
How long should dual antiplatelet therapy continue after a stent?
It depends on the balance of ischaemic and bleeding risk. The DAPT score helps decide after an uneventful first year: a score of 2 or more suggests benefit from continuing beyond twelve months, while a lower score favours stopping. High bleeding risk, for example a PRECISE-DAPT score of 25 or more, points the other way, toward a shorter course.
What is the difference between CRUSADE and PRECISE-DAPT?
Both estimate bleeding risk, but in different patients at different moments. CRUSADE predicts in-hospital major bleeding in non-ST-elevation myocardial infarction. PRECISE-DAPT predicts bleeding after coronary stenting and is used to plan the duration of dual antiplatelet therapy at discharge.
What does the Diamond-Forrester score tell me about chest pain?
It estimates the pre-test probability of coronary artery disease from age, sex and whether the pain is typical, atypical or non-anginal. That probability decides the next step: very low probability needs no cardiac testing, intermediate probability justifies non-invasive testing, and high probability may warrant angiography directly.
Are these tools a substitute for a cardiologist's judgement?
No. Scores summarise population data and apply it to one person, which means they are wrong in exactly the cases where the patient differs from the average. Use them to structure decisions, document reasoning and support conversations with patients, and overrule them when the clinical picture demands it.
Medical disclaimer
These calculators are educational tools for clinicians, students and informed readers. They do not provide medical advice, and no score or result should replace the judgement of a qualified health professional who has seen the patient. If you are unwell or worried about a result, seek professional care promptly.