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12 Cardiology Calculators – Risk, Lipids, QTc & Hemodynamics

Cardiology calculators include population-specific cardiovascular risk models, acute and perioperative scores, atrial-fibrillation risk-factor scores, QT correction, hemodynamic arithmetic, and lipid calculations.

Preserve each model's population, endpoint, time horizon, measurement method, and clinical question; a percentage or point total is not portable between models.

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Find a Cardiology calculator

Search the calculators in this category by name, short name, or the task description. The full task-group listing remains below.

Enter a term to narrow this category; all calculators remain available in the task groups below.

Which tool fits this task?

Compare the purpose, inputs, and returned measure before opening a calculator. These distinctions describe tool scope; they do not make a diagnosis or choose treatment.

Long-term cardiovascular risk

Compare model identity before comparing percentages: population, endpoint, and horizon are part of the result's meaning.

AHA PREVENT-ASCVD Risk Calculator

Use when
Estimate the AHA PREVENT-ASCVD model output for its supported primary-prevention population.
Inputs
Model population, sex coefficient, age, total cholesterol, HDL-C, systolic blood pressure, eGFR, BP treatment, statin use, diabetes, and current smoking.
Returns
PREVENT-ASCVD 10-year and, where supported by age, 30-year risk estimates.
Distinction
This is a current model-specific estimate and is not a Framingham endpoint or treatment threshold.

Framingham General CVD Risk Calculator

Use when
Calculate the historical lipid-based Framingham General CVD model for adults 30–74 without established CVD at baseline.
Inputs
Age, sex branch, lipids, systolic pressure, treatment, smoking, and diabetes inputs.
Returns
A 10-year general-CVD model percentage.
Distinction
It is a historical model-specific estimate and is not ASCVD-only or a current statin decision.

Atrial-fibrillation risk-factor scores

These scores address different risk questions and are not substitutes for one another.

Classic CHA₂DS₂-VASc Score Calculator

Use when
Calculate the classic CHA₂DS₂-VASc point score in its established AF/flutter context.
Inputs
Documented age, clinical history, sex category, and vascular or neurologic factors.
Returns
A classic point total with the page's neutral audit.
Distinction
It is a stroke-risk-factor score, not a bleeding score or an anticoagulation prescription.

HAS-BLED Bleeding Risk Calculator

Use when
Calculate the original HAS-BLED bleeding-risk-factor score in its stated AF/anticoagulation context.
Inputs
The score's hypertension, renal/liver, stroke, bleeding, INR, age, drug, and alcohol inputs.
Returns
A HAS-BLED point total.
Distinction
It addresses bleeding-risk factors and does not replace CHA₂DS₂-VASc or select treatment.

Acute coronary and perioperative risk

Use the tool that matches the clinical setting rather than treating all cardiac scores as interchangeable.

Classic GRACE 1.0 Score Calculator

Use when
Calculate the classic GRACE 1.0 score in its acute-coronary-syndrome context.
Inputs
Age, heart rate, systolic pressure, creatinine, Killip class, arrest, ST deviation, and biomarkers.
Returns
A GRACE score from the submitted ACS variables.
Distinction
Its population and endpoint differ from noncardiac-surgery risk scoring.

Revised Cardiac Risk Index (RCRI) Calculator

Use when
Calculate the Revised Cardiac Risk Index for the supported noncardiac-surgery risk-factor set.
Inputs
The six documented RCRI clinical factors.
Returns
An RCRI point total.
Distinction
RCRI is a perioperative risk-factor model, not an ACS score or an operative recommendation.

Lipid measures and ratios

These tools use related lipid-panel values but return different quantities; preserve whether LDL-C was measured or estimated.

Traditional Friedewald LDL-C Calculator

Use when
Calculate the traditional fixed-divisor Friedewald LDL-C estimate from a same-panel lipid set.
Inputs
Total cholesterol, HDL-C, and triglycerides from the same lipid panel and supported unit.
Returns
Friedewald LDL-C, non-HDL-C, and the page's estimated VLDL audit values.
Distinction
Only the historical Friedewald method runs here; Martin/Hopkins, Sampson/NIH, direct LDL-C, and beta-quantification are not re-calculated.

Non-HDL Cholesterol Calculator

Use when
Calculate non-HDL-C when total cholesterol and HDL-C are available from the same assessment.
Inputs
Total cholesterol and HDL-C in the same supported concentration unit.
Returns
The TC − HDL-C cholesterol concentration.
Distinction
Non-HDL-C is a concentration, not a ratio, LDL-C re-estimate, or particle count.

Total Cholesterol-to-HDL Ratio Calculator

Use when
Calculate the total-cholesterol-to-HDL-C ratio from a same-panel pair.
Inputs
Total cholesterol and HDL-C in the same supported concentration unit.
Returns
A unitless TC/HDL-C ratio.
Distinction
It is a quotient and does not re-calculate LDL-C or assign a treatment target.

LDL-to-HDL Cholesterol Ratio Calculator

Use when
Calculate the LDL-C-to-HDL-C ratio from a same-panel pair when the LDL-C value is already available.
Inputs
Submitted LDL-C and HDL-C in the same supported concentration unit.
Returns
A unitless LDL-C/HDL-C ratio.
Distinction
The page uses the submitted LDL-C and does not infer whether it was measured or which laboratory method produced it.

Choose a calculator by task

Use the task groups below to find the calculator whose formula, intended population, required measurements, and purpose match the task.

Cardiovascular and clinical risk scores

Match the established population and outcome for PREVENT-ASCVD, historical Framingham General CVD, GRACE, RCRI, classic CHA₂DS₂-VASc, or original HAS-BLED.

AHA PREVENT-ASCVD Risk CalculatorEstimate 10-year and age-eligible 30-year risk of a first ASCVD event with the corrected AHA PREVENT base equations.Framingham General CVD Risk CalculatorCalculate the D’Agostino 2008 lipid-based 10-year Framingham general CVD estimate for eligible adults aged 30–74 without established cardiovascular disease.Classic GRACE 1.0 Score CalculatorCalculate the classic 2003 GRACE bedside point score for in-hospital mortality in adult acute coronary syndrome.Revised Cardiac Risk Index (RCRI) CalculatorCalculate the original six-item Lee RCRI point score and class for adult preoperative assessment before noncardiac surgery, with source-specific limitations.Classic CHA₂DS₂-VASc Score CalculatorCalculate the classic 2010 CHA₂DS₂-VASc risk-factor point total for adults with clinician-established atrial fibrillation or atrial flutter.HAS-BLED Bleeding Risk CalculatorCalculate the original 2010 HAS-BLED 0–9 bleeding-risk-factor score for adults with established atrial fibrillation.

Rhythm and hemodynamic measures

Use measured ECG intervals and heart rate for QTc comparison, or paired systolic and diastolic pressure for conventional MAP estimation.

QTc Calculator – Bazett, Fridericia, Framingham & HodgesCompare four fixed heart-rate correction formulas from a measured QT interval and representative heart rate, with ECG measurement and interpretation limits.Mean Arterial Pressure (MAP) CalculatorEstimate conventional mean arterial pressure from one systolic and diastolic blood-pressure reading using the one-third pulse-pressure formula.

Lipid arithmetic

Use same-panel lipid values and preserve the stated LDL-C measurement or estimation method when calculating LDL-C, non-HDL-C, or cholesterol ratios.

Traditional Friedewald LDL-C CalculatorReproduce the traditional 1972 Friedewald LDL-C estimate from one same-unit lipid panel, with exact triglyceride boundaries and current-method limitations.Non-HDL-CNon-HDL Cholesterol CalculatorCalculate non-HDL cholesterol from total cholesterol minus HDL-C from the same lipid panel, with unit-safe arithmetic and guideline-context limitations.TC/HDL RatioTotal Cholesterol-to-HDL Ratio CalculatorCalculate the unitless total cholesterol-to-HDL-C ratio from one same-panel lipid profile, with exact arithmetic and current-guideline limitations.LDL/HDL RatioLDL-to-HDL Cholesterol Ratio CalculatorCalculate the unitless LDL-C-to-HDL-C ratio from one same-panel lipid profile, with method-aware arithmetic and current-guideline limitations.

Match the model to the population and endpoint

  • Confirm the model population, endpoint, and time horizon before comparing cardiovascular risk estimates.
  • Use classic CHA₂DS₂-VASc and HAS-BLED only in their stated clinician-established atrial fibrillation or flutter contexts.
  • For QTc and lipid arithmetic, preserve the measurement method, same-ECG or same-panel timing, and formula identity.

Important limits

  • QT correction formulas can differ, and no one formula is automatically selected for every rhythm, rate, QRS width, or clinical setting.
  • Risk scores and lipid ratios do not establish a diagnosis or measure the causal benefit of a treatment change.
  • These tools do not recommend anticoagulation, medication, procedures, referral, or discharge.

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